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In a random sample of 28 families, the average weekly food expense was $95.60 with a standard deviation of $22.50. Determine whether a normal distribution or a t-distribution should be used or whether neither of these can be used to construct a confidence interval. Assume the distribution of weekly food expenses is normally shaped.
Draw the scatter graphs for the other pairings in Table 15.2 and come to a decision whether the relationships are linear. Note the pattern-data link.
Suppose a fast food restaurant wishes to estimate average sales volume for a new menu item. The restaurant has analyzed the sales of the items at a similar outlet and observed the following results:
What is the probability that of today's 1,300 callers at least 5 received a busy signal? Use the poisson approximation to the binomial.
What is the probability that she finds at least one of the students cheating? (Round your intermediate calculations and final answers to 4 decimal places.)
Use the decision rule associated with part (a) and a range of selected assumed values for µ in constructing the power curve for the test.
Assuming a normal distribution, if 70 percent of the costs for tires is less than $171.00, what is the standard deviation? How is this calculated?
Briefly describe correlational research. Name a variable from the workplace that might prove to provide a correlational relationship and explain why you would choose these two?
Identify a pair of variables for which you would expect to see a strong correlation but not a cause-and-effect relationship. Suggest an explanation for the association.
descriptive statistics for given data.weekly salaries in dollars for a sample of registered nurses are
If a randomly selected student is a female student, what is the probability she is a C student?
provide me half page response to each discussion post. for the discussion 1 and discussion 2 tell me what you liked
an inspector inspects large truckloads of potatoes to determine the proportion in the shipment with major defects prior
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