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Probability Statistics

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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Probability Statistics

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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Probability Statistics

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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Probability Statistics

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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Probability Statistics

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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Probability Statistics

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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Probability Statistics

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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Answers •1

Probability Statistics

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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Probability Statistics

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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Answers •1

Probability Statistics

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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Probability Statistics

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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Probability

12/18/21

Probability of independent events: Decimal answers

Of the people who fished at Clearwater Park today, 48 had a fishing license, and 12 did not. Of the people who fished at Mountain View Park today, 49 had a license, and 21 did not. (No one fished... more

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Probability

12/18/21

Probabilities of draws without replacement

A box contains 5 red balls and 7 orange balls. If Tim chooses 6 balls at random from the box, what is the probability that he will select 4 red balls and 2 orange balls? Round your answer... more

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Probability

12/18/21

Probability of independent events: Decimal answers

A student ran out of time on a multiple-choice exam and randomly guessed the answers for two problems. Each problem had 4 answer choices – a, b, c, d – and only one correct answer. What is... more

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Probability

12/18/21

Probability of independent events: Decimal answers

At a local college, 245 of the male students are smokers and 245 are non-smokers. Of the female students, 180 are smokers and 420 are non-smokers. A male student and a female student from the... more

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Probability

12/18/21

Probabilities of draws without replacement

An urn contains 5 red balls and 7 orange balls. If Tim chooses 6 balls at random from the urn, what is the probability that he will select 4 red balls and 2 orange balls? Round your answer... more

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Probability Statistics

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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Probability Statistics

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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Probability Statistics

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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Probability Statistics 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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Probability

12/16/21

What is the probability that both of the people you interview are women?

Twelve women and fourteen men have applied for a job posting. You are responsible for interviewing applicants. Assume that you are selecting two applicants at random for an interview. Draw a tree... more

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Probability Math Algebra Highschool Math

12/16/21

Determine the probability of randomly selecting a green piece of clothing or a jacket.

3) A basket contains 4 red Santa hats, 6 green Elf hats, 5 red jackets, and 7 green jackets. Determine the probability of randomly selecting a green piece of clothing or a jacket. (A)... more

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Probability Statistics 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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Probability

12/15/21

Probability Practice Questions

Show that if X and Y are independent random variables, then Var(X+Y)= Var(X)+Var(Y).

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Probability Statistics

12/14/21

Statistics question

2) The number of auto parts that a company produces follows a normal distribution. The company has two independent production lines: Line 1 produces an average of 75 parts per day with a... more

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what is/are the critical values?

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.

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

Probability of independent events: Decimal answers

Probabilities of draws without replacement

Probability of independent events: Decimal answers

Probability of independent events: Decimal answers

Probabilities of draws without replacement

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

What is the probability that both of the people you interview are women?

Determine the probability of randomly selecting a green piece of clothing or a jacket.

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?

Probability Practice Questions

Statistics question

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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