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The president of Doerman Distributors, Inc., believes that 30% of the firm's orders come from first-time customers. A random sample of 100 orders will be used to estimate the proportion of first-time customers. Assume that the president is correct and p=0.30.
a. What is the probability that the sample proportion will be between 0.20 and 0.40?
b. What is the probability that the sample proportion will be between 0.25 and 0.35?
c. What is the probability that the sample proportion will be greater than 0.37?
Critically discuss the reasons for studying statistics? Choose five random numbers between 70-100. Calculate the mean, and midrange of these numbers.
Set up hypotheses and test to find out whether or not population variance is larger than $100.
Give an example of a hypothesis test you could perform at work or at home. State what the Null and the Alternative hypotheses would be in your test.
lowering the price does not decrease this behavior and we should not decide to lower prices based on this research." Comment on the executive's conclusion. What type of inference is being made? Will the decision not to lower prices be a good one.
Shall we reject the hypothesis that the population mean is 6.0? Interpret the result.
A large internet retailer, is studying the lead time (elapsed time between when an order is placed and when it is filled) for a sample of recent orders. The lead times are reported in days.
Assume if the students toss the coin 200 times each about 68% should have proportions among what two numbers.
The grade point averages for 10 randomly selected high school students are listed below. Assume the grade point averages are normally distributed.
A basketball player shoots 8 free throws during a game. If we assume that each attempt has the same probability of success, the sample space for the number of baskets he/she makes during the game is ??
Calculated the probability of observing a sample proportion of voters 0.55 or higher supporting the incumbent governor.
Solve the equations using linear algebra
Is there evidence of violations of the usual ANOVA assumptions of equal variances and normal populations? Set up and perform appropriate TESTS at the α = 0.05 level of significance.
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