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1. a. After 3 points have been added to every score in a sample, the mean is found to be M =83 and the standard deviation is s=8. What were the values for the mean and standard deviation for the original sample?
b. After every score in a sample has been multiplied by 4, the mean is found to be M =48 and the standard deviation is s =12. What were the values for the mean and standard deviation for the original sample?
Use the study to estimate the risk of an air bag fatality on a child seated on the front passenger seat.
Flying over the western states with mountainous terrain in a small aircraft is 40% riskier than flying over similar distances in flatter portions of the nation. Find the probability of no accidents in 100,000 flight operations.
A railway company operates a number of different services. One of these connects two cities and the journey time is assumed to be normally distributed with a mean of 125 minutes and a standard deviation of 5 minutes.
Specify the null and alternative hypotheses you would use to determine if the opinions of Internet users are evenly divided among the four categories.
The distance (in miles) are as follows:32,18,44,29,25,38,14,21,and 12. Estimate the mean commute distance of all employees of the company.
for each equation below identify what type of equation it is linear or exponential which variable is the independent
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.
At a 0.05 level of significance, does this data show that 2 year college students and private unversity students work an equivalent amount of time?
Compare two models. Model #1 has an r-squared of .55 and an adjusted r-squared of .50. Model #2 has an r-squared of .52 and an adjusted r-squared of .51. Given this information, what model should you use?
Assuming the population standard deviation of the amount spent per owner is $12, construct and interpret a 95% confidence interval for the mean amount spent per owner for an obedience class.
Explain why we need to use the t distribution. What assumption do you need to make?
according tonbspadvertising agenbspthe average base salary for women working as copywriters in advertising firms is
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