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Statistics Math

12/25/21

Significance level

Five measurements of the tar content of a certain kind of cigarette yielded 14.5, 14.2, 14.4, 14.3 and 14.6 mg/cigarette. Assuming that the data are a random sample from a normal population, show... more

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Statistics Math

12/24/21

hypothesis testing

an examination was given to two classes each consisting of 49 students. In the first class the mean marks were 74 with a standard deviation of 8; in the second class the mean marks were 78 with a... more

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Statistics Math

12/24/21

mean median histogram

A sample of the daily earnings of a food vendor on a street was collected for 300 days. The distribution of earnings is as follows:Earning range($): 100-200 200-250 250-300 ... more

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Statistics Probability

12/21/21

what is/are the critical values?

The data in the accompanying table represent the compressive strength, in thousands of pounds per square inch (psi), of 20 samples of concrete taken two and seven days after pouring. Complete... more

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Statistics

12/21/21

Dummy variables

Is there anyone that can explain to me how I execute a regression analysis with IBM SPSS statistics using dummy variables?

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Statistics Probability

12/21/21

What is the test statistic zstat= ?

A cellphone provider has a business objective of wanting to determine the proportion of subscribers who would upgrade to a new cellphone with improved features if it were made available at a... more

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Statistics Probability

12/21/21

what is the test statistic here? Zstat = ?

A cellphone provider has the business objective of wanting to determine the proportion of subscribers who would upgrade to a new cellphone with improved features if it were made available at a... more

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Statistics Probability

12/21/21

The worldwide market share for a web browser was 20.5% in a recent month. Suppose that a sample of 240 random students at a certain university finds that 60 use the browser.

b. Suppose that a sample of n=800 students at the same university (instead of n=240) determines that 25% of the sample use the web browser. At the 0.01 level of significance, is there evidence... more

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Statistics Probability

12/21/21

The data in the accompanying table represent the compressive strength, in thousands of pounds per square inch (psi), of 20 samples of concrete taken two and seven days after pouring.

Sample Two days Seven... more

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Statistics T Test One Tailed t Test Writing A Research Question

12/20/21

When is the One-tailed t-Test the appropriate choice?

I will explain the purpose and function of t-Tests (compare two means scores) Explain that the probability value .05 is applied directionally - exclusively one direction (higher or lower than the... more

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Statistics Probability

12/20/21

If X=70, S=12, and n=16, and assuming that the population is normally distributed, construct a 90% confidence interval estimate of the population mean, μ. please round to two decimal places.

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Statistics Probability

12/20/21

If X=70, S=12, and n=16, and assuming that the population is normally distributed, construct a 90% confidence interval estimate of the population mean, μ. please round to two decimal places.

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Statistics Probability

12/20/21

stats hw final practice 10

Assume there is a sample of n1=4, with the sample mean X1=37 and a sample standard deviation of S1=2, and there is an independent sample of n2=5 from another population with a sample mean of... more

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Statistics Probability

12/20/21

If X=70, S=12, and n=16, and assuming that the population is normally distributed, construct a 90% confidence interval estimate of the population mean, μ.

If X=70, S=12, and n=16, and assuming that the population is normally distributed, construct a 90% confidence interval estimate of the population mean, μ. please round to two decimal places.

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Statistics Probability

12/20/21

b. Determine the p-value and interpret its meaning. The p-value is

A manufacturer of chocolate candies uses machines to package candies as they move along a filling line. Although the packages are labeled as 8 ounces, the company wants the packages to contain a... more

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Statistics Probability

12/20/21

hw 8 question 10, please answer part a and b

A cellphone provider has the business objective of wanting to determine the proportion of subscribers who would upgrade to a new cellphone with improved features if it were made available at a... more

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Statistics Geometry Economics

12/19/21

Suppose that $2000 is invested at a rate of 5.5%, compounded semiannually. Assuming that no withdrawals are made, find the total amount after 3 years.

Homework question that I can't seem to get correct....Suppose that $2000 is invested at a rate of 5.5%, compounded semiannually. Assuming that no withdrawals are made, find the total amount after 3... more

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Statistics Probability

12/18/21

Let n1 =100, x1=60 , n2 =100, and x2=80 . Complete part (b) below.

Calculate the test statistic, ZSTAT, based on the difference p1−p2.The test statistic, ZSTAT, is negative 3.09−3.09.(Type an integer or a decimal. Round to two decimal places... more

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Statistics Probability

12/17/21

According to a recent report, 44% of college student internships are unpaid. A recent survey of 100 college interns at a local university found that 49 had unpaid internships.

a. Use the five-step p-value approach to hypothesis testing and a 0.01 level of significance to determine whether the proportion of college interns that had unpaid internships is different from... more

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Statistics Probability

12/17/21

In a one-tail hypothesis test where you reject only in the lower tail, what is the if zstat = +1.08

What is the P vlaue?

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Statistics Probability Stats

12/16/21

Probability Question

A thermostat is set on 70 degrees. A room temperature is distributed normally with the standard deviation of .1. What is the probability that the room temperature will be higher than 70.2 degrees?

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Statistics

12/16/21

If you randomly select three peanut M&M’s, compute that probability that at least one of them is blue.

If you randomly select three peanut M&M’s, compute that probability that at least one of them is blue.According to Masterfoods, the company that manufactures M&M’s, 12% of peanut M&M’s... more

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Statistics Math

12/16/21

math i need help asap

More and more people are abandoning national brand products and buying store brand products to save money. The president of a company that produces national brand coffee claims that 40% of the... more

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Statistics Math

12/16/21

i need help anyone?

According to a 2020 study, the average cost of gas, oil, tires, and maintenance on commuters who travel 15,000 miles per year in their own vehicles was $1770. A recent study based on 300 such... more

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Statistics Probability Maths

12/16/21

If the height of students in one school follows a normal distribution with a mean of 160 cm and a standard deviation of 5 cm. What is the percentage of the students with a height of 155-165 cm?

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Significance level

hypothesis testing

mean median histogram

what is/are the critical values?

Dummy variables

What is the test statistic zstat= ?

what is the test statistic here? Zstat = ?

The worldwide market share for a web browser was 20.5​% in a recent month. Suppose that a sample of 240 random students at a certain university finds that 60 use the browser.

The data in the accompanying table represent the compressive​ strength, in thousands of pounds per square inch​ (psi), of 20 samples of concrete taken two and seven days after pouring.

When is the One-tailed t-Test the appropriate choice?

If X=70​, S=12​, and n=16​, and assuming that the population is normally​ distributed, construct a 90% confidence interval estimate of the population​ mean, μ. please round to two decimal places.

If X=70​, S=12​, and n=16​, and assuming that the population is normally​ distributed, construct a 90% confidence interval estimate of the population​ mean, μ. please round to two decimal places.

stats hw final practice 10

If X=70​, S=12​, and n=16​, and assuming that the population is normally​ distributed, construct a 90% confidence interval estimate of the population​ mean, μ.

b. Determine the​ p-value and interpret its meaning. The​ p-value is

hw 8 question 10, please answer part a and b

Suppose that $2000 is invested at a rate of 5.5%, compounded semiannually. Assuming that no withdrawals are made, find the total amount after 3 years.

Let n1 =100​, x1=60 ​, n2 =100​, and x2=80 . Complete part​ (b) below.

According to a recent​ report, 44% of college student internships are unpaid. A recent survey of 100 college interns at a local university found that 49 had unpaid internships.

In a​ one-tail hypothesis test where you reject only in the lower ​tail, what is the if zstat = +1.08

Probability Question

If you randomly select three peanut M&M’s, compute that probability that at least one of them is blue.

math i need help asap

i need help anyone?

If the height of students in one school follows a normal distribution with a mean of 160 cm and a standard deviation of 5 cm. What is the percentage of the students with a height of 155-165 cm?

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The worldwide market share for a web browser was 20.5% in a recent month. Suppose that a sample of 240 random students at a certain university finds that 60 use the browser.

The data in the accompanying table represent the compressive strength, in thousands of pounds per square inch (psi), of 20 samples of concrete taken two and seven days after pouring.

If X=70, S=12, and n=16, and assuming that the population is normally distributed, construct a 90% confidence interval estimate of the population mean, μ. please round to two decimal places.

If X=70, S=12, and n=16, and assuming that the population is normally distributed, construct a 90% confidence interval estimate of the population mean, μ. please round to two decimal places.

If X=70, S=12, and n=16, and assuming that the population is normally distributed, construct a 90% confidence interval estimate of the population mean, μ.

b. Determine the p-value and interpret its meaning. The p-value is

Let n1 =100, x1=60 , n2 =100, and x2=80 . Complete part (b) below.

According to a recent report, 44% of college student internships are unpaid. A recent survey of 100 college interns at a local university found that 49 had unpaid internships.

In a one-tail hypothesis test where you reject only in the lower tail, what is the if zstat = +1.08