Only 13,14,15 When drawing inferences about the mean of one population, the corr
ID: 80366 • Letter: O
Question
Only 13,14,15 When drawing inferences about the mean of one population, the correct statistical model to use is: A) the normal curve. B) the t distributions. C) the t distributions if the population standard deviation is known and the normal curve if the population standard deviation is not known. D) the normal curve if the population standard deviation is known and the t distributions if the population standard deviation is not known. If we specify a range of values within which a parameter (such as a population mean) is likely to fall, this range can be referred to as: A) an interval estimate. B) the limits of confidence. C) a point estimate. D) a statistical estimate. The t distribution that you use to find your critical values closely resembles the normal distribution when: A) the sample mean is large. B) the sample variance is large. C) the sample size is large. D) the population standard deviation is large. The critical t value for a one-group experiment will never be: A) less than zero. B) less than 2. C) smaller than the corresponding critical z. D) larger than the corresponding critical z. As the size of the samples increase, the standard error of the difference: A) becomes smaller. B) remains the same. C) becomes larger. D) cannot be determined from the information given When testing hypotheses about the difference between the means of two populations, the degrees of freedom are: A) N_1 + N_2 B) N_1 - N_2 C) N_1 + N_2 - 1 D) N_1 + N_2 - 2 A researcher wishes to test the hypothesis that a persuasive message about our government will change people's attitudes toward politicians. Each of 20 subject's attitudes is measured before and after receiving the message. The correct procedure to use is: A) the t test with independent samples. B) the z test with independent samples. C) the t test with matched samples. D) the z test with matched samples.Explanation / Answer
13. As the size of the samples increases the standard error of the difference: A) becomes smaller
14. Degrees of freedom=D) N1+N2-2
15. Option C) t test with matched samples.
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