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Unformatted text preview: 1. The mean of the population sampling distribution of x is given by A) µ B) x σ C) µx D) x 2. A random sample of 90 observations produced a mean x = 25.9 and a standard deviation of s = 2.7. Find a 95% confidence interval for the population mean µ. A) (25.34, 26.46) B) (25.34, 26.63) C) (25.841, 25.958) D) (25.63, 26.17) 3. What happens to the width of a confidence interval as the value of the confidence coefficient is increased while the sample size is held fixed? A) Increases B) Decreases C) Remains unchanged 4. Suppose you have selected a random sample of n = 7 measurements from a normal distribution. Compare the standard normal z-values with the corresponding t-values if you were forming a 95% confidence interval? A) 1.943 B) 2.447 C) 1.895 D) 2.365 5. The __________ represents the status quo to the party performing the sampling experiment. 5....
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- Spring '11
- Statistics, Null hypothesis, Statistical hypothesis testing