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A large supermarket chain would like to estimate the amount of time people spend looking at a particular type of in store display. From similar studies they believe the standard deviation of the time would be around 6.2 minutes. If they would like to estimate the true average time to within 1.9 minute (with 95% confidence) what sample size should they use? (remember to round to the next largest integer.)
Construct a 99% confidence interval for the average length of usage time to recharge.
Using the .05 significance level, can we conclude that there is a positive association between the two variables?
On the same chart, produce a graph showing the original probability mass function, and a line graph showing your selected continuous probability density function.
Perform 5 t-tests on the data comparing C1 to C2 on each of the 5 questions. Indicate which of the 5 variables has a difference between C1 and C2.
What is the probability that at least 8 of the next 15 errors are due to operator errors? What is the probability that no more than 3/10 failures are due to operators?
Determine whether the difference in proportions is significant at the 0.05 level.
Ccompute a t-test comparing males' and females' heights. You must determine which type of t-test to compute. Write a short interpretation of the results.
What is the sensitivity and specificity of the test? Suppose that 1 out of 500 infants are born with Down's syndrome.
Assume that a 95% confidence interval estimate of the population mean annual starting salary is required. What is the planning value for the population standard deviation?
Explain the difference between a logarithm of a product and the product of logarithms and give examples of each.
The mean of a normal distribution is 400 pounds. The standard deviation is 10 pounds. a) what is the area between 415 pounds and the mean of 400 pounds?
Test the claim of the brewery about the mean volume equal to 32 oz. at the 0.05 significance level. It's your choice whether to use z or t.
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