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A survey is planned to determine the mean annual family medical expenses of employees of a large company. The management of the company wishes to be 95% confident that the sample mean is correct to within plus-or-minus $50 of the population mean. A previous study indicates that the standard deviation is approximately $400.
a) How large a sample size is needed?
b) If management wants to be correct to within plus-or-minus $25, what sample size is necessary?
Determine the probability that employee will make 28 or more sales during 100-call shift? Allocate a Random Variable x.
Find a 90% confidence interval for the population mean weight of all such turtles.
Decision rule which chooses alternative associated with smallest maximum opportunity loss is?
what is the probability that the sample mean of IQ scores will not differ from the population mean by more than 2 points? (Round your answer to four decimal places.)
If you were designing a study which group, a population or a sample, would you gather data from and why? Provide an explanation regarding whether or not the standard deviation is a biased or unbiased estimate.
A study of 40 bowlers showed that there average score was 186 the standard deviation of the population is 6. Find the 95% confidence interval of the mean score for all bowlers.
At 0.05 level of significance, is there enough evidence to conclude that difference exists between proportion of students who have ear infections at one school and the other?
How does a researcher determine the meaning of a score on a norm-referenced test such as an IQ test? Why are raw scores transformed to standardized scores, such as z-scores, in order to interpret those raw scores?
Computing the probability values using normal distribution - Evaluate the percentage of homes that generate between 27 and 31 pounds of recycling per month.
At the .01 significance level, can we conclude that there is more variation?
What is the probability that the first two cards dealt yields "Black Jack"?
For the data shown below, prepare a x-bar chart. Note that the sample size is three. Record the values for the UCL, center line, and LCL. In addition, note any points that are out of control.
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