Stats Unit 11 Study Guide Test 2024.

Stats Unit 11 Study Guide Test 2024. Bags of a certain brand of tortilla chips claim to have a net weight of 14 ounces. Net weights actually vary slightly from bag to bag and are normally distributed with mean μ. A representative of a consumer advocate group wishes to see if there is any evidence that the mean net weight is less than advertised and so intends to test the hypotheses H0: μ = 14, Ha: μ < 14. To do this, he selects 16 bags of this brand at random and determines the net weight of each. He finds the sample mean to be J = 13.88 and the sample standard deviation to be s = 0.24. Based on these data, we would conclude - CORRECT ANSWER we would reject H0 at significance level 0.05 but not at 0.025 The mean area μ of the several thousand apartments in a new development is advertised to be 1250 square feet. A tenant group thinks that the apartments are smaller than advertised. They hire an engineer to measure a sample of apartments to test their suspicion. The appropriate null and alternative hypotheses, H0 and Ha, for μ are - CORRECT ANSWER H0: μ = 1250 and Ha: μ < 1250. The mean weight μ of a particular type of candy bar is supposed to be 2.5 oz. A quality control technician takes a sample of 25 bars to find out whether the mean has deviated from specifications. The appropriate null and alternative hypotheses, H0 and Ha, for μ are - CORRECT ANSWER H0: μ = 2.5 and Ha: μ ≠ 2.5 In testing hypotheses, which of the following would be strong evidence against the null hypothesis? - CORRECT ANSWER Obtaining data with a small P-value n a statistical test of hypotheses, we say the data are statistically significant at level α if - CORRECT ANSWER P-value is less than a The Survey of Study Habits and Attitudes (SSHA) is a psychological test that measures the motivation, attitude, and study habits of college students. Scores range from 0 to 200 and follow (approximately) a normal distribution with mean 115 and standard deviation σ = 25. You suspect that incoming freshmen have a mean μ, which is different from 115, because they are often excited and anxious about entering college. To test your suspicion, you test the hypotheses