Exercises_on_one-sample_t-test

# Exercises_on_one-sample_t-test - d This can not be...

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March 18, 2010 Introduction to the t Test Multiple-Choice Questions #1- The reason we use N – 1 in the variance formula when using samples is: a) to determine the degrees of freedom. b) because we randomly delete one score. c) to create an unbiased estimate of the population variance. d) none of the above. #2- When estimating the variance of a population from the sample, you divide by the sample size minus one, because using the sample size directly: a) does not correct for squaring the deviations. b) underestimates the population variance. c) Fails to take into account the sample size. d) creates too little “bias”. #3- If a study yields a t score of 2.46, and the cutoff t score was 2.36, should you reject the null hypothesis? Why or why not? a) Yes, because the computed t score is more extreme than the cutoff score. b) No, because the computed t score is more extreme than the cutoff score. c) No, because the computed t score is too close to the cutoff t score distribution to be significant.

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Unformatted text preview: d) This can not be determined without knowing the degrees of freedom. #4- Which of the following is an assumption you must make before you can use t tests? a) The sample is normally distributed. b) The sample is skewed. c) The population is normally distributed. d) The population is skewed. #5- A research article reports results of a study using a t test as “t(16) = 2.67, p < .05.” This means: a) the result is not significant. b) there were 16 subjects. c) the t score was 16. d) the t score was 2.67. Computation #1- An urban planner is interested in whether people who live in noisy parts of a city have worse hearing. To test this, she administers hearing tests to six randomly selected 18-year-olds that have grown up in one of the noisiest parts of the city. Their scores on the hearing test are 16, 14, 18, 18, 20, and 16. This test was designed so that healthy 18- year-olds should score 20. (The variance is not known). What should she conclude?...
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Exercises_on_one-sample_t-test - d This can not be...

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