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1.) The mean number of English courses taken in a two-year time period by male and female college students is believed to be about the same. An experiment is conducted and data are collected from 29 males and 16 females. The males took an average of three English courses with a standard deviation of 0.8. The females took an average of four English courses with a standard deviation of 1.0. Are the means statistically the same?2.) A student at a four-year college claims that mean enrollment at four-year colleges is higher than at two-year colleges in the United States. Two surveys are conducted. Of the 35 two-year colleges surveyed, the mean enrollment was 5,068 with a standard deviation of 4,777. Of the 35 four-year colleges surveyed, the mean enrollment was 5,466 with a standard deviation of 8,191.
"These are to be complete Hypothesis test starting with Ho & Ha and ending with a decision based on the rejection region or the p-value." "Find Z (crit) for two tail test withα =.05"
1. for a standard normal model find the z-value that is less than the mean and for which 67 of the area under the
one important use of regression line is to do which of the following?a. to determine the strength of a linear
Set up H0 and Ha for testing whether the true percentage of TV viewers who find cable news to be better quality than network news differs from 50%.
1. explain the relationship between variance and standard deviation. can either of these be negative?expline2. find the
in the formula for a variance what is the sum if we dont square the x-u values? hint there is a special name for this
You have been asked to test whether data support company's claim? Test at α = 0.05. Suppose normality.
A stationery store wants to estimate the mean retail value of greeting cards that it has in its inventory. A random sample of 100 greeting cards indicates a mean value of $2.55 and a standard deviation of $0.44.
What is the relationship between pretest scores and final exam scores after controlling for cumulative GPA? He also wants to know about the relationship between pretest scores and final exam scores.
Your employer asks you to determine whether current salaries (DV) can be predicted from years of experience (IV) What is the right statistical test one should use and why?
Suppose n progeny are to be examined, and let P^ be the sample proportion of purple-owered plants. It might happen, by chance, P^ that would be closer to 1/2 than to 9/16. Find the probability that this misleading event would occur if:
a student took two national aptitude tests. the national average and standard deviation were 675 and 150 respectively
When writing about the probability that it will rain in Boston on July 4 of next year, a newspaper reporter states that the probability is ½, because either it will rain or it will not.
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