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A biology professor claimed that the proportions of grades in his classes are the same. A sample of 100 students showed the following frequencies:
GradeA B C D E
Frequency18 20 28 23 11
State the null and alternative hypotheses to be tested.
Determine the rejection region at the 5% significance level.
Compute the value of the test statistics.
Determine the 90% confidence interval for average days worked by employees in all payroll departments?
1. The speed of automobiles on a section of I-95 is normally distributed with a population mean of 65 miles per hour and a population standard deviation of 8 miles per hour. A random sample of 30 cars is to be selected for a speed study.
"What is the five-step process for hypothesis testing? Is the order important? Why or why not?"
At the .01 significance level can we conclude the mean age is more than 8.4 years for the cars of university students? State the null hypothesis and the alternate hypothesis.
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.
You want to test the hypothesis that the mean age for teachers is equal to 50. If you take a sample of 64 observations and find a sample mean of 49
How large a sample should you take if you want to be 95% confident of the results and you want the error of the confidence interval to be no more than .05?
Find out the suitable critical value(s) for this situation given a 0.05 significance level. Find out/compute the value of sample test statistic.
Ages of 56 attendees of a Harry Potter movie are shown. (a) Form seven age classes (10 to 20, 20 to 30, etc.). Tabulate the frequency of attendees in each class.
The F-test cannot be used to answer whether or not there is a significant difference between the means.
How is a sampling distribution of the mean similar to and different from a distribution of raw scores? What is the standard deviation of a sampling distribution of the mean called? How is it affected by sample size?
An educational study uses a simple pre-post design to assess the efficacy of a computer tutor for solving inequalities. Twelve pilot students participate. Each student is given a pre-test, then participates in six sessions using the tutor, then i..
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