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ou want to know if redesign of the New Whole Foods has significantly increased sales. You sample 25 customers who shop there regularly. You get the amount spent by these customers during the month before and the month after the opening of the new store. You find the following: The sample mean increase in sales for these customers was $15. The standard deviation of the difference was $40. Assume the distribution of customer sales is normal.
Set up hypotheses for this test.
Calculate the p-value and draw conclusions to determine if sales have increased since the new store opened. Use significance level of .01.
Would your conclusion in part b have been different if your significance level had been .05?
Calculate the 95% confidence interval for the difference between the amount spent per month before and after the opening of the new store. Explain what the specific values for your confidence interval mean.
Construct a 95% confidence interval estimate of their mean weight.
Using a normal distribution with a mean of 1118 and a standard deviation of 52 for the weights of steers, what percent of steers weigh over 1250 pounds, under 1100 pounds, between 1000 and 1150 pounds.
Show that z and iz have the same modulus. How are the graphs of these two numbers related?
Develop regression models to predict the selling price based upon each of the other factors individually. Which of these is best?
To determine whether or not they have a certain desease, 80 people are to have their blood tested. However, rather than testing each individual separately, it has been decided first to group the people in groups of 10.
Assume that a decision maker wants to estimate a population proportion with 90% confidence and a margin of error of ±0.03. The decision maker has obtained a pilot sample of 10.
one year professional sports players salaries averaged 2 million with a standard deviation of 1 million. suppose a
Starting with the initial solution derived by the nw corner method identify the cell w/the best cost improvement index and the quantity that can be transferred to that cell.
Describe what type of control chart you can use and how do you calculate the control limits (provide formula) to check if the calculate the control limits in this organization is in control.
The manager of a sport fishing products company wants to test the null hypothesis that a certain lead fishing weights have a mean weight of 4.0 ounces. Under what conditions would the manager commit a Type 1 error?
Why is it important that a sample be random and representative when conducting hypothesis testing?
We are interested in testing to see if the variance of a population is less than 7. The correct null hypothesis is:
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