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For a sample of 100 recent credit-card customers of a company's on-line store, the following data are available: the dollar amount of merchandise ordered during the visit, how much time (minutes) the customer spent at the site during the purchase visit, and whether the customer used a Visa credit card.
Describe the format of a linear regression equation for estimating the dollar amount of the order on the basis of the other variables described above. If any qualitative variables are used, indicate the strategy for coding them.
Standard deviation is $0.10. At α = 0.01, is there significant difference in price? Determine the 99% confidence interval of the difference in the means.
the cost of parking is 9 per day. suppose that if you were to park illegally the probability of getting a ticket is
Does this data provide evidence at the .05 significance level that there is a difference in the proportion of humorous ads in British versus American trade magazines? Please show work.
ifteen watch springs are selected from the production line and measured; their weights are 8, 3, 4, 8, 1, 4, 4, 9, 9, 2, 8, 4, 9, 7, and 7 grams. Assume = 0.01.Determine which test statistic is appropriate (chi-square or F), and calculate its value..
to be able to conduct a t-test it is importantthat the independent- as well as the dependent variable is measured on a
in a small pond there are 50 fish 10 of which have been tagged. if a fishermans catch consists of 7 fish selected at
Using the grades.sav file, compare the GPA variable (gpa) with the mean GPA of the university of 2.89. Using the divorce.sav file, compare men with women (sex) for lsatisfy, trauma, age, school, cogcope, behcope, avoicop, iq, close, locus, asq, soc..
How would you go about studying a nonlinear or curvilinear relationship between two variables using contingency tables and chi-square tests? Provide examples from you own professional experience.
1. There are six combinations, or samples, of two grand prizes that can be randomly selected from the four grand prizes 20, 40, 60, and 80 thousand dollars. Four of these samples are (20, 40), (20, 60), (20, 80), and (40, 60). Find the other two ..
give the appropriate t quantile value tdf 1 - a2 that would be used to construct a confidence interval for the mean of
A. What is the 90% confidence interval for the daily sales at all restaurants. B. What is the probability that the average sales are really $32,000 or more per day? Assume that the population average is $30,000 per day and the std. Deviation is $2..
Construct a control chart for the proportion of dissatisfied customers. Revise the control limits, assuming special causes for points outside the control limits.
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