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QUESTION 12 The level of calcium in the blood of healthy young adults follows a Normal distribution with mean / = 10 milligrams per deciliter and standard deviation o = 0.4. A clinic measures the blood calcium of 25 healthy pregnant young women at their first visit for prenatal care. The mean of these 25 measurements is * = 9.6. Is this evidence that the mean calcium level in the population from which these women come is less than 10? To answer this, test the following hypotheses. Ho : H 2 10 VS. Ha : H = 5.2 days. Is this evidence that the mean time to be cured is actually more than advertised? To answer this, test the following hypotheses a significance level a = 0.01. Ho : HS5, Ha : H > 5 You conclude that "Ho should be rejected. Ho should not be rejected. Ha should be rejected. there is a 5% chance that the null hypothesis is true. QUESTION 14 The time needed for college students to complete a certain midterm follows a Normal distribution with a mean of 70 minutes and a standard deviation of 15 minutes. You wish to see if the mean time / is changed by playing music, so you have a group of nine college students listen to music during the exam. It takes them an average of = 64 minutes to complete the midterm exam. Use this information to test the following hypotheses at a significance level of a = 0.01. Ho : H = 70 vs. Ha : H # 70 You conclude that Ho should be rejected. Ho should not be rejected. Ha should be accepted. this is a borderline case and no decision should be made.QUESTION 15 The scores of a certain population on the Wechsler Intelligence Scale for Children IV (WISC IV) are thought to be Normally distributed with mean / and standard deviation o= 15. Bill is a child psychologist who obtains a simple random sample of 25 children from this population and each is given the WISC IV. Bill wishes to test whether the mean for this population differs from the national average of 95, so he uses the hypotheses Ho : H = 95 and Ha : #95, based on an SRS of size 25 from the population. Bill then calculates a 95% confidence interval for u and finds it to be 98.42 to 110.20. Then he would reject Ho at the 0.05 level. he would reject Ho at the 0.05 level. he would fail to reject Ho at the 0.05 level. a mistake has almost certainly been made. The confidence interval must contain / = 100 at least 95% of the time