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Sales at a fast-food restaurant average $6,000 per day. The restaurant decided to introduce an advertising campaign to increase daily sales. To determine the effectiveness of the advertising campaign, a sample of 49 days of sales was taken. It found that the average daily sales were $6,400 per day. From past history, the restaurant knew that its population standard deviation is about $1,000. The value of the test statistic is?
Suppose these means were based on a random sample of 100 homes in 1997 and 150 homes in 1998 and that the sample standard deviations of sale prices were $21,000 for 2000 and $23,000 for 2001. Find a 98% con?dence interval for the difference in the ..
You will want to use software to find the regression equation, either a TI calculator or Statdisk or other software you have found useful. The sales of a company (in million dollars) for each year are shown in the table below.
If the population mean is estimated within two days, how many salespeople should be sampled?
given are five observations collected in a regression study on two variables.x12691320y1718926231. what percentage of
which of the follow samples will have the smallest value for estimated standard error?n 100 with s2nbsp 100n 25 with
the manager of a supermarket found that 72 of the shoppers who taste a free sample of a food item will buy the item.
suppose iq scores were obtained from randomly selected siblings. for 20 such pairs of people the linear correlation of
Assume the population standard deviation (s) is 0.5 and the sample size (n) is 100. Calculate the values for alpha, a type I error and beta, a type II error. (To calculate Beta, consider a mean that is 1 standard error away from the lower end valu..
Find the mean and standard error of the sample means that is normally distributed with a mean of 10 and a standard deviation of 2 and a sample size of 25.
a researcher is studying the relationship between earnings for major electronic firms and research and development
Determine the upper control limit (UCL) and lower control limit (LCL) for an X-Bar chart if six samples of subgroup size 5 (n=5) were collected, and the mean of the sample averages is 4.7 and mean of the sample ranges is 0.35.
List the requirements that should be met for this hypothesis test. Write the null and alternative hypothesis. Calculate the test statistic and the P-value. Label each accordingly
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