Determining the zscore and p value
How is the rejection region defined and how is that related to the zscore and p value?
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How many workers need to be sampled in order to estimate the population proportion of workers who worried about retiring comfortably to within +/- 0.02 with 95% confidence?
Suppose that we are testing H0: µ = µ0 versus H1: µ > µ0. Calculate the P -value for the following observed values of the test statistic (round all answers to 4 decimal places).
A sample of n = 7 scores has a mean of M = 9. One score in the sample is changed from X = 19 to X = 5. What is the value for the new sample mean?
Assume that the mean hourly cost to operate a commercial airplane follows the normal distribution with a mean of $2,225 per hour and a standard deviation of $275.
what requirements are necessary for a normal probability distribution to be a standard normal probability distribution?
A time for the 100-meter spring of 15.1 seconds at a school where the mean time for the 100-meter sprint is 17.6 seconds and the standard deviation is 2.2 seconds. Find the z score corresponding to the given value and use the z score to determine
Discuss the effect that sample size on the width of confidence intervals.
A loan officer in a large bank has been assigned to screen 60 loan applications during the next week. If her past record indicates that she turns down 20% of the applicants, what is the approximate probability that 50 or more of the 60 applicants
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