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01/28/22

Algebra Caffeine problem

Rebecca drinks a cup of coffee every morning at 5:00 am. The amount of caffeine (in mg) in her body as a result of drinking this coffee is given by the function 𝐴(𝑡) = 200(1/2)^t/6, where 𝑡 is time... more

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Statistics

01/28/22

if y=2(x+4) square -1 what is the axis symmetry

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Statistics

01/28/22

Mathematics/Stats

In a study of government financial aid for college students, it becomes necessary to estimate the percentage of -time college students who earn a bachelor's degree in four years or less. Find the... more

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Statistics

01/27/22

AP Statistics X-Bar Questions

Based on long experience, an airline found that about 2% of the people making reservations on a flight from Miami to Denver do not show up for the flight. Suppose the airline overbooks this flight... more

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Statistics

01/27/22

AP Statistics X-Bar Question

In the following problem, check that it is appropriate to use the normal approximation to the binomial. Then use the normal distribution to estimate the requested probabilities.It is estimated... more

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Statistics

01/26/22

Marco enjoys playing hockey in his spare time. In his past 6 seasons, the number of goals he has scored each season is as follows:

[16,19,17,24,21,17]a) What is the sample standard deviation?

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Statistics

01/26/22

Brandon works as a statistician for the Toronto Blue Jays, and wants to analyze the relationship between a player’s age and how many strikeouts they accumulate in a season.

He takes a sample of 7 Blue Jays players with age between 25 and 34 and finds there is a linear relationship between their ages and the number of strikeouts they had in the 2015 season. Here are... more

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Statistics

01/26/22

Suppose Isabella has developed the following fitted regression equation for the price of a Edmonton condo: Price= 151000 + 47*(Square footage)

a) If someone wants to purchase a 700 sq. ft. Edmonton condo, how much should they expect to pay?b) If they want to buy a unit that is 89 square feet bigger, then how much more money should they... more

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Statistics

01/26/22

An economics professor decides to curve the grades of his class. In doing so, he decides to make it such that the students who score in the top 11% receive an A.

Assume a normal distribution among grades. How many standard deviations above the mean must a student get to receive an A? (Round to 2 decimal places, if needed)

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Statistics

01/26/22

The average credit score in Canada is 650. Assume that credit scores follow a normal distribution with a standard deviation of 80. (Round each to nearest integer)

a) Find the 85th percentile of credit scores in Canada.b) 65% of Canadians have a credit score higher than what value?c) Mac’s credit score is 720. In what percentile is his credit score?

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Statistics

01/26/22

Find area under the standard normal distribution represented by each probability. (Round to 4 decimal places)

a) P(Z < 0.11):b) P(Z > 0.4):c) P(-0.66 < Z < 1.93):d) P(Z = 1.38):

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Statistics

01/26/22

A Tim Horton’s has recently opened up in Edmonton. Mean=6 mins, Standard deviation=2.6 mins

a)What is the best probability that it takes less than 5.6 mins for a randomly selected car to be served after ordering? (Round to 4 decimal places)b)What is the probability that it takes more than... more

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Statistics

01/26/22

normally distribution population

RTK Antigen Test is carried out to detect viral proteins related to the Covid-19 virus to determine active infection. Since September 2021, Malaysia government has set the maximum ceiling prices... more

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Statistics

01/25/22

Can I use a one-sample t test to compare the number of sea fans on one solid reef with the average number of sea fans on three boulder reefs.

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Statistics Business Accounting

01/24/22

You have a student loan of $20,000. since it is not a federally subsidized loan, it will generate interest over the course of 4 years.

Let’s say you get a rate of 1% applied monthly. Show the calculation you will do to find how much you will owe by the time you graduate

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Statistics

01/22/22

What is the estimated standard error for a sample of n = 9 scores with s2 = 36?

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Statistics

01/21/22

a) What is the point estimate,b) What is the margin of error

If a confidence interval for the mean is (44 ≤ μ ≤ 98), a) What is the point estimate? b) What is the margin of error

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Statistics

01/21/22

Which of the following would result in the widest confidence interval?

Which of the following would result in the widest confidence interval? a) A sample size of 100 with 90% confidence b) A sample size of 30 with 95% confidence. c) A sample size of 100 with 95%... more

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Statistics

01/21/22

How many more bacteria should you sample to achieve a 0.45-hour margin of error?

You are a researcher studying the lifespan of a certain species of bacteria. A preliminary sample of 40 bacteria reveals a sample mean of 72 hours. The standard deviation is known to be... more

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Statistics

01/21/22

How large of a sample size is required?

You want to obtain a sample to estimate the average number of hours per week Nexford Statistics students work at their job while being a full-time student. Based on previous evidence, you believe... more

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Statistics

01/21/22

How large of a sample size is required?

You want to obtain a sample to estimate the average number of hours per week Nexford students work at their job while being a full-time student. Based on previous evidence, you believe the... more

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Statistics

01/21/22

How large of a sample size is required?

You want to obtain a sample to estimate the average number of hours per week community college students in the United States work at their job while being a full-time student. Based on previous... more

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Statistics

01/21/22

Find the 99% confidence interval.

You must estimate the mean temperature (in degrees Fahrenheit) with the following sample temperatures. Assume the temperatures are normally distributed. Find the 99% confidence... more

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Statistics

01/21/22

Construct a 90% confidence interval in the form estimate+_ margin of error

In a survey 21 people were asked how much they spent on their child last birthday gift.The results were roughly bell shaped with a mean of $40a and standard deviation of $19 . Construct a 90%... more

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Statistics

01/21/22

explain the mean of the interval in a sentence

The effectiveness of a blood pressure drug in being investigated.An experiment finds that on average the reduction in systolic blood pressure is 57.6 for a sample of size 846 and standard deviation... more

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Algebra Caffeine problem

if y=2(x+4) square -1 what is the axis symmetry

Mathematics/Stats

AP Statistics X-Bar Questions

AP Statistics X-Bar Question

Marco enjoys playing hockey in his spare time. In his past 6 seasons, the number of goals he has scored each season is as follows:

Brandon works as a statistician for the Toronto Blue Jays, and wants to analyze the relationship between a player’s age and how many strikeouts they accumulate in a season.

Suppose Isabella has developed the following fitted regression equation for the price of a Edmonton condo: Price= 151000 + 47*(Square footage)

An economics professor decides to curve the grades of his class. In doing so, he decides to make it such that the students who score in the top 11% receive an A.

The average credit score in Canada is 650. Assume that credit scores follow a normal distribution with a standard deviation of 80. (Round each to nearest integer)

Find area under the standard normal distribution represented by each probability. (Round to 4 decimal places)

A Tim Horton’s has recently opened up in Edmonton. Mean=6 mins, Standard deviation=2.6 mins

normally distribution population

Can I use a one-sample t test to compare the number of sea fans on one solid reef with the average number of sea fans on three boulder reefs.

You have a student loan of $20,000. since it is not a federally subsidized loan, it will generate interest over the course of 4 years.

What is the estimated standard error for a sample of n = 9 scores with s2 = 36?

a) What is the point estimate,b) What is the margin of error

Which of the following would result in the widest confidence interval?

How many more bacteria should you sample to achieve a 0.45-hour margin of error?

How large of a sample size is required?

How large of a sample size is required?

How large of a sample size is required?

Find the 99% confidence interval.

Construct a 90% confidence interval in the form estimate+_ margin of error

explain the mean of the interval in a sentence

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