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A small stock brokerage firm wants to determine the average daily sales (in dollars) of stocks to their clients.A sample of the sales for 36 days revealed average daily sales of $200,000. Assume that the standard deviation of the population is known to be $18,000.
a. Provide a 95% confidence interval estimate for the average daily sale.
b. Provide a 97% confidence interval estimate for the average daily sale.
the rent for a one-bedroom apartment in southern california follows the normal distribution with a mean of 2475 per
A department store, on average, has daily sales of $28,707.47. The standard deviation of sales is $1000. On Tuesday, the store sold $34,650.77 worth of goods. Find Tuesday's z score. Was Tuesday an unusually good day?
Probability of survival of eggs to breeding adults at the next time step is 0.4. Probability of survival of adults to the next time step is 0.7. What is average R?
find the standardized test statistics t for a sample with n 12 sample mean 19.2 s 2.2 and a 0.01 if h0 u 18 round
For the samples summarized below, test the hypothesis at =0.05 that the two variancees are equal.
Determine the mean and the standard deviation of the following frequency distribution. (Round your answers to 2 decimal places.)
An averaged department store sells 350 mens suits per year. The mens suit departments at a particular national chain of stores claim they sell more than the industry average.
A doctor believes that the variance of systolic blood pressure is 470. A random sample of 20 patients found a variance of 525. What is the smaller critical value that would be used in a hypothesis test at a .05 significance level?
Bill calculates a linear correlation coefficient between two variable as 1.20. How would you interpret this?
Assume that the class has 60 students and that the examination period is 90 minutes in length. How many students do you expect will be unable to complete the exam in the allotted time.
What is the probability that the trainee class will consist entirely of men or women? Round your answer to the nearest thousandth.
how many different permutations of the word scissors are there? how many permutations have all four ss together? how
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