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The head of the English department wants to determine if the average number of students taking an English course differs depending upon the time of day that the course is being offered. Is there a significant difference between the mean attendance for the classes given for 0.05 alpha ?
Morning 25 26 27 26 27
Afternoon 25 24 18 20 23
Evening 27 26 24 23 25
A) Yes, there is a significant difference between the means.
B) No, there is no significant difference between the means.
C) The F-test cannot be used to answer whether or not there is a significant difference between the means.
Identify the type of sampling (random, systematic, convenience, stratified, cluster) used when a sample of people who smoke is obtained as described below.
Suppose Abraham Lincoln had answered a survey questionnaire in which he indicated that he had not received a grade school diploma. The researcher found that Lincoln's educational score did not correlate with the expected variables. What was wrong?
At 5 % level of significance, does this sample prove violation of the guideline that average patient muts pay no more than $250 out-of-pocket? Is this a close decision?
Using symbols mention null hypothesis and alternative hypothesis.
More than 13 successes in 19 trials with a 40 percent chance of success. (Round the answer to 4 decimal places.) Fewer than 7 successes in 15 trials with a 40 percent chance of success. (Round the answer to 4 decimal places.)
Change the frequencies to percentages - is there a group more likely to get high salaries.
Using the following number of flirtations actions in the 4 hour period, test the "null hypothesis'
Find a 98% confidence interval for the mean number of days required for successful completion of physical therapy for patients in the average group. Discuss the results.
The machine will stop working if more than three components fail. Find the probability that the machine will be working.
Determine the test value? Use α = 0.05. (Use the variances unequal formula).
If the sample consists of n = 15 individuals, then compute df value for the t statistic?
Find the test statistic value for testing the equality of population means of the two samples.
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