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Weights were measured for 5 female and 5 male beetle pupae. Test the hypothesis of no difference in mean weight of females and males versus the alternative that a difference exists. Use a 5% level of significance.
Pupae Weight (g)
Females Males
1.2 0.7
1.4 1.2
0.9 0.9
1.3 0.8
1.0 1.0
Standard deviation of 0.7 inches. If 21 items is chosen at random, what is the probability that their mean length is less than 10.5 inches.
In an experiment in which a die was rolled 188 times it was counted up how many times each face came up. The results are as follows:
Systolic blood pressures are measured at baseline and again 4 weeks later. Compute a 95% confidence interval for the mean difference in blood pressure over 4 weeks.
The times it takes workers to complete a task at a certain assembly plant are normally distributed with mean = 10 minutes and standard deviation = 2 minutes.
Jack is doing a project in educational psychology. Before the experiment, he rank-orderes all his participants according to achievement test scores.
Public transportation and the automobile are two methods an employee can use to get to work each day. Samples of times recorded for each method are shown. Times are in minutes.
a sample of size 200 from population 1 has 50 successes. a sample of size 200 from population 2 has 40 successes. what
For the variable you identify another graphical display that might be useful and construct it. What conclusions can you reach from this other plot that cannot be made from the boxplot?
Your firm has 3 different manufacturing lines that each produce the same type of widget
The sample size n , the sample means, and the sample standard deviations for the two groups are given below.
What is the correlation between student cumulative GPA and the numbers of hours spent on school work each week? Be sure to include the computations.
Identify a pair of variables for which you would expect to see a strong correlation but not a cause-and-effect relationship. Suggest an explanation for the association.
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