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Exam 12: Introduction to Statistical Inference: Testing Hypotheses About Single Means Z and T

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Exam 1: Introduction25 Questionsadd course
Exam 2: Frequency Distributions, Percentiles,34 Questionsadd course
Exam 3: Graphic Representation of Frequency Distributions25 Questionsadd course
Exam 4: Central Tendency25 Questionsadd course
Exam 5: Variability and Standard Z Scores37 Questionsadd course
Exam 6: Standard Scores and the Normal Curve27 Questionsadd course
Exam 7: Correlation38 Questionsadd course
Exam 8: Prediction40 Questionsadd course
Exam 9: Interpretive Aspects of Correlation and Regression23 Questionsadd course
Exam 10: Probability29 Questionsadd course
Exam 11: Random Sampling and Sampling Distributions24 Questionsadd course
Exam 12: Introduction to Statistical Inference: Testing Hypotheses About Single Means Z and T74 Questionsadd course
Exam 13: Interpreting the Results of Hypothesis Testing: Effect Size, Type I and Type II Errors, and Power42 Questionsadd course
Exam 14: Testing Hypotheses About the Difference Between Two Independent Groups33 Questionsadd course
Exam 15: Testing for a Difference18 Questionsadd course
Exam 16: Inference About Correlation Coefficients24 Questionsadd course
Exam 17: An Alternative to Hypothesis Testing: Confidence Intervals28 Questionsadd course
Exam 18: Testing for Differences Among Three or More Groups: One-Way Analysis of Variance and Some Alternatives49 Questionsadd course
Exam 19: Factorial Analysis of Variance30 Questionsadd course
Exam 20: Chi-Square and Inference About Frequencies27 Questionsadd course
Exam 21: Some Almost Assumption-Free Tests19 Questionsadd course
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The human resources director of a large corporation determines the typing speeds of a random sample of secretaries from his company on certain standard materials. He wishes to test the hypothesis that the mean for his population is equal to 50 words per minute, the national norm for secretaries on these materials. Explain in general terms the logic and procedures for testing his hypothesis.

(Essay)
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Question 21

If If and and the critical values of z are when and when what would we do if our calculated value of z were +2.30? and If and and the critical values of z are when and when what would we do if our calculated value of z were +2.30? and the critical values of z are If and and the critical values of z are when and when what would we do if our calculated value of z were +2.30? when If and and the critical values of z are when and when what would we do if our calculated value of z were +2.30? and If and and the critical values of z are when and when what would we do if our calculated value of z were +2.30? when If and and the critical values of z are when and when what would we do if our calculated value of z were +2.30? what would we do if our calculated value of z were +2.30?

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Question 22

When the population deviation is unknown, the standard error of the mean may be estimated by

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Question 23

The null hypothesis is a statement that is

(Multiple Choice)
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Question 24

Which statement, if any, is false? The t distribution and the normal distribution of z are alike in that both

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Question 25

The choice between a one-tailed test and a two-tailed test

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Question 26

Which of the first three statements, if any, is false? Which of the first three statements, if any, is false? is is

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Question 27

If If the null hypothesis will be the null hypothesis will be

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Question 28

The problem with using S as an estimate of The problem with using S as an estimate of is that S is that S

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Question 29

Which of the first three statements, if any, is false? Which of the first three statements, if any, is false? is is

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Question 30

For the following sample of two scores: 1, 3, the best estimate of the population standard deviation is

(Multiple Choice)
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Question 31

For a sample of 16 cases, the best estimate of the population standard deviation is calculated to be 8.36. The best estimate of the standard error of the mean (for samples of size 16) is

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Question 32

If the sample mean is of the kind that could readily occur when the null hypothesis is true, we will

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Question 33

Which statement, if any, is false? The distribution of t

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Question 34

A training director for a large company has been told that on completion of the training course he has been using for some time, the average score of his trainees should be at least 100. His only concern is whether he will have to begin remedial steps to insure that the population of trainees is not below standard. A sample of 15 recent trainees finds: A training director for a large company has been told that on completion of the training course he has been using for some time, the average score of his trainees should be at least 100. His only concern is whether he will have to begin remedial steps to insure that the population of trainees is not below standard. A sample of 15 recent trainees finds: (a) Set up and (b)Perform the statistical test ( (c)Draw final conclusions. (d)Now repeat using (a) Set up A training director for a large company has been told that on completion of the training course he has been using for some time, the average score of his trainees should be at least 100. His only concern is whether he will have to begin remedial steps to insure that the population of trainees is not below standard. A sample of 15 recent trainees finds: (a) Set up and (b)Perform the statistical test ( (c)Draw final conclusions. (d)Now repeat using and A training director for a large company has been told that on completion of the training course he has been using for some time, the average score of his trainees should be at least 100. His only concern is whether he will have to begin remedial steps to insure that the population of trainees is not below standard. A sample of 15 recent trainees finds: (a) Set up and (b)Perform the statistical test ( (c)Draw final conclusions. (d)Now repeat using (b)Perform the statistical test ( A training director for a large company has been told that on completion of the training course he has been using for some time, the average score of his trainees should be at least 100. His only concern is whether he will have to begin remedial steps to insure that the population of trainees is not below standard. A sample of 15 recent trainees finds: (a) Set up and (b)Perform the statistical test ( (c)Draw final conclusions. (d)Now repeat using (c)Draw final conclusions. (d)Now repeat using A training director for a large company has been told that on completion of the training course he has been using for some time, the average score of his trainees should be at least 100. His only concern is whether he will have to begin remedial steps to insure that the population of trainees is not below standard. A sample of 15 recent trainees finds: (a) Set up and (b)Perform the statistical test ( (c)Draw final conclusions. (d)Now repeat using

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Question 35

S2

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Question 36

In testing a null hypothesis, the sample mean is compared with

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Question 37

For the following sample of three scores: 1, 3, 5, the best estimate of the standard error of the mean is

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Question 38

A biased estimator is one that yields an estimate that is

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Question 39

We wish to test the null hypothesis that the mean is 80. If We wish to test the null hypothesis that the mean is 80. If is known, the normal curve model is appropriate when n is is known, the normal curve model is appropriate when n is

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Question 40
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