Suppose it is desired to estimate the average time a customer spends in a particular store...
Suppose it is desired to estimate the average time a customer
spends in a particular store to within 5 minutes with 99%
confidence. It is estimated that the range of the times a customer
spends in the store is 90 minutes. How large a sample should be
taken to get the desired interval? Right-click the link to use this
Z table
(The answer is NOT 135, or 134.37) (I believe the standard
deviation is not 22.5)
The answer is 60, you're welcome
Homework Answers
If the sample size n is small then range/4 is the best estimator for the standard deviation
If the sampel size n is large then range/6 is the best estimator for the standard deviation
Now, SD = Range / 6 = 90/4 = 15
Add Answer to:
Suppose it is desired to estimate the average time a customer
spends in a particular store...
In developing patient appointment schedules, a medical center wants to estimate the mean time that a...
In developing patient appointment schedules, a medical center wants to estimate the mean time that a staff member spends with each patient. How large a sample should be taken if the desired margin of error is two minutes at a 95% level of confidence? How large a sample should be taken for a 99% level of confidence? Use a planning value for the population standard deviation of 6 minutes. 95% Confidence (to the nearest whole number): 99% Confidence (to the...
QUESTION 7 In developing patient appointment schedules, a medical center wants to estimate the mean time...
QUESTION 7 In developing patient appointment schedules, a medical center wants to estimate the mean time that a staff member spends with each patient. How large a sample should be taken if the desired margin of error is two minutes at a 99% level of confidence? Use a planning value for the population standard deviation of 8 minutes. 100 102 104 106
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a) Approximately 500 students take a particular college statistics course each year. As an exercise, each...
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Please Help with BOTH 1) 2) A CI is desired for the true average stray-load loss...
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A CI is desired for the true average stray-load loss u (watts) for a certain type of induction motor when the line current is held at 10 amps for a speed of 1500 rpm. Assume that stray-load loss is normally distributed with o = 2.6. (Round your answers to two decimal places.) (a) Compute a 95% CI for u when n = 25 and x = 53.0. 1 watts (b) Compute a 95% CI...
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In developing patient appointment schedules, a medical center wants to estimate the mean time that a staff member spends with each patient. How large a sample should be taken if the desired margin of error is two minutes at a 95% level of confidence? How large a sample should be taken for a 99% level of confidence? Use a planning value for the population standard deviation of 6 minutes. 95% Confidence (to the nearest whole number): 99% Confidence (to the...
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a) Approximately 500 students take a particular college statistics course each year. As an exercise, each of the 500 students in the class is given a different random sample of the previous year's 500 final grades (in percentages) and asked to construct a 95% interval estimate of the previous year's overall average. Which of the following statements is correct? About 475 of the confidence intervals will contain the actual overall average for the previous year. It is probable that 475...
Please Help with BOTH
1)
2)
A CI is desired for the true average stray-load loss u (watts) for a certain type of induction motor when the line current is held at 10 amps for a speed of 1500 rpm. Assume that stray-load loss is normally distributed with o = 2.6. (Round your answers to two decimal places.) (a) Compute a 95% CI for u when n = 25 and x = 53.0. 1 watts (b) Compute a 95% CI...
You want to obtain a sample to estimate a population mean. Based on previous evidence, you believe the population standard deviation is approximately o = 52.6. You would like to be 90% confident that your estimate is within 2 of the true population mean. How large of a sample size is required? Hint: Video [+] n = Question Help: Message instructor Submit Question The body temperatures in degrees Fahrenheit of a sample of adults in one small town are: 96.3...
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