You would like to construct a 95% confidence interval to estimate the population mean price of milk (per gallon) in your city. You select a random sample of prices from different stores. The sample has a mean of 3.66 dollars and a standard deviation of 0.20 dollars.(a) What is the best point estimate, based on the sample, to use for the population mean? [ ] dollars(b) For each of the following sampling scenarios, determine which distribution should be used to calculate the critical value for the 95% confidence interval for the population mean. (In the table, Z refers to a standard normal distribution, and t refers to a t distribution.)| Sampling scenario | Z | t | Could use either Z or t | Unclear ||-------------------------|----|---|---------------------------|---------|| The sample has size 17, and it is from a normally distributed population with an unknown standard deviation. | ⃝ | ⃝ | ⃝ | ⃝ || The sample has size 110, and it is from a non-normally distributed population with a known standard deviation of 0.27. | ⃝ | ⃝ | ⃝ | ⃝ || The sample has size 105, and it is from a non-normally distributed population. | ⃝ | ⃝ | ⃝ | ⃝ |

Answered: You would like to construct a 95%…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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Use the normal distribution of SAT critical reading scores for which the mean is 501 and the standard deviation is 116. Assume the variable x is normally distributed. (a) What percent of the SAT verbal scores are less than 625? (b) If 1000 SAT verbal scores are randomly selected, about how many would you expect to be greater than 550? Click to view page 1 of the standard normal table. Click to view page 2 of the standard normal table. (a) Approximately% of the SAT verbal scores are less than 625. (Round to two decimal places as needed.) (b) You would expect that approximately SAT verbal scores would be greater than 550. (Round to the nearest whole number as needed.)
What is the age distribution of adult shoplifters (21 years of age or older) in supermarkets? The following is based on information taken from the National Retail Federation. A random sample of 895 incidents of shoplifting gave the following age distribution. Estimate the mean age, sample variance, and sample standard deviation for the shoplifters. For the class 41 and over, use 45.5 as the class midpoint. (Round your answers to one decimal place.) Age range (years) 21-30 31-40 41 and over Number of shoplifters 254 364 277 x = s2 = s =
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