Please Answer All Questions Accordingly 1 (28.58 KiB) Viewed 39 times
Please Answer All Questions Accordingly 2 (35.3 KiB) Viewed 39 times
33. A simple random sample of 100 postal employees is used to test if the average time postal employees have worked for the postal service has changed from the value of 7.5 years recorded 20 years ago. The sample mean was = 8 years with a standard deviation of s=2 years. Assume the distribution of the time the employees have worked for the postal service is approximately Normal. The hypotheses being tested are Ho: μ = 7.5, H₁ μ‡7.5 with a one-sample t test. Suppose the same mean and standard deviation was obtained on a sample of size n = 90 postal workers rather than 100. How would the t statistic change in magnitude? μ (Hint: t = ) s/√/12 O It would be larger. O It would be smaller. O It would be unchanged, because the difference between and the hypothesized value = 7.5 is unchanged. O It would be unchanged, because the variability measured by the standard deviation stayed the same.
Is there a relationship between brain size and intelligence? The Performance IQ scores (PIQ) and brain sizes (in pixels, as measured by MRI scans) of 40 subjects were measured. A researcher used simple linear regression using brain size to predict PIQ and reported the following results. Variable Coefficient 1.74 Standard error 42.39 Intercept (Bo) Brain size (1) 0.0001203 0.0000465 34. The researcher decided to ignore the p-value from the test of the null hypothesis: Ho: B₁= 0 stating that such a test is meaningless when the slope is obviously very close to zero. Do you agree with this researcher (yes/no?) and then justify (explain) your option (5 points). A) Agree B) Disagree *** Please remember to explain it.
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