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A sample of 25 diff. payroll dept found that the employees worked an average of 310.3 days with a std dev. of 23.8 days. what is the 90% confidence interval for the average days worked.
T-scores are used on some psychological tests, such as the MMPI. T-scores have a mean of 50 and a standard deviation of 10, and therefore a z-score of -1 (one standard deviation below the mean) would be converted to a T-score of 40.
What minimum sample size will be required if they want to be 99% confident that the sample proportion will not differ from the true population proportion by more than 5%?
In a large university, 15% of the students are female. If a random sample of twenty students is selected,
Determine probability, P(Z
The value of "Z" chosen for constructing (calculating) the confidence interval estimate is determined by
Annual family dental expenses for the families of a random sample of ten employees of a company are given below. You can assume the family dental expenses for the employees of the company are normally distributed.
Draw the graph of the regression line on the same plot as the scatter diagram above.
In the history class the mean score was 76 with standard deviation 3.
Assuming that the manager's claim is correct, calculate the probability that 117 or fewer of 205 randomly selected marketing researchers would disapprove of the scenario.
The average score in the sample was 84 with a variance of 12.25. The 95% confidence interval for the average examination score of the population of the examinations is?
Could the interval be used to estimate the mean amount of time a 9-year-old American spends eating & drinking each day. Explain.
Copying times average 8 minutes according to an exponential distribution. What are the operating characteristics for this system?
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