Question

9. In their advertisements, the manufacturers of a certain brand of oatmeal would like to claim that eating their oatmeal for breakfast daily will produce a mean decrease in cholesterol of more than 10 points in one month for people with cholesterol levels over 200. In order to determine if this is a valid claim, they hire an independent testing agency, which then selects 25 people with a cholesterol level over 200 to eat their oatmeal for breakfast daily for a month. The agency should be testing the null hypothesis Ho: 10 and the alternative hypothesis a, Ha: μ<10 b. Ha: u>10 С. На: d. Hai μ # 10 10 /t 10. The mean area μ of the several thousand apartments in a new development by a certain builder is advertised to be 1250 square feet. A tenant group thinks this may be different, because it is based on the square footage of apartments in an older development by the same builder. The group hires an engineer to measure a sample of apartments to verify its suspicion. The appropriate null and alternative hypotheses, Ho and Has for u are a. Ho: μ-1250 and Ha: μ 1250 b/10-,-1250 and Ha: μ < 1250. c. Ho: 1250 and Ha: > 1250. d. cannot be specified without knowing the size of the sample used by the engineer. 11. Is the mean age at which American children can first read now under 4 years? If the population of all American children has mean age of μyears until they begin to read and standard deviation ơ years, one would test which of the following null and alternative hypotheses to answer this question? b. Ho: 4 vs. Ha: u 4 d. Ho : μ 4 vs. Ha : μ-4 , assuming our sample size is n

Answer 1

option (b) H_a: mu > 10 option(a) H_0: mu = 1250 and H_a: mu notequalto 1250 option (c)