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A local eat-in pizza restaurant wants to investigate the possibility of starting to deliver pizzas. The owner of the store has determined that home delivery will be successful only if the average time spent on a delivery does not exceed 40 minutes. The owner has randomly selected 18 customers and delivered pizzas to their homes in order to test whether the mean delivery time actually exceeds 40 minutes. What assumption is necessary for this test to be valid?
None. The Central Limit Theorem makes any assumptions unnecessary.
The sample mean delivery time must equal the population mean delivery time.
The population variance must equal the population mean.
The population of delivery times must have a normal distribution.
If the store orders three copies of the magazine, what is the mean value of the profit? (Profit = Revenue - Cost). If the store orders four copies of the magazine, is it better to order four than three copies of the magazine. Explain.
Construct a 90 percent confidence interval for the proportion of all kernels that would not pop.
correlations chirps per secondground temperature in f chirps per secondpearson correlation1.836 sig. 2-tailed .000 n15
70 people received a higher score on the second test, 13 a lower score, and 1 received the same score. At the 0.05 significance level, test the claim that the music has no effect on memorization skills.
Leading product are falling leading to declining revenues. Draft a research proposal for the client based on a scientific methodology.
rolling a fair eight-sided die produces a uniformly distributed set of numbers between 1 and 8 with a mean of 4.5 and a
The starting salaries of individuals with an MBA degree are normally distributed with mean of $40,000 and standard deviation of $5,000. What percentage of MBA's will have starting salaries of $34,000 to $46,000?
Calculate the probability that fewer than half of the patients are chain smokers. b) suppose that 20 patients with lung cancer are admitted to the hospital.
Considering that the probability of event C is .44, of event D is .20, and the probability of their intersection is .088, determine whether C and D are dependent or independent events.
Using your experience from previous or current employment, provide a business example where you could use a t-test to assist in a business decision. State the null and alternative hypothesis.
X is normally distributed with a mean of 250 and a standard deviation of 40. What value of X does only the top 15% exceed?
Standardized scores offers a way of comparing norm-referenced scores. The z-score distribution is based on knowing how many standard deviations away from the mean a certain score is.
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