null hypothesis?

review(31a) MAKE SURE YOU SELECT TWO ANSWERS FOR THIS QUESTION.. Type of test and hypotheses. Professor dill  wonders if male and female earn significantlly differnent grades, when taking the same course with the same instructor. He randomly samples 160 males. and 100 females. The males receive 20 A's, 32 B's 70 C's  30 D's, anf 8 F's.The female receive 20'A's, 28 B's, 30 C's, and 10 D's. and 12 F's; His hypotheses is that gender and grades are related. Choose the type of test you should choose to test the hypotheses in symbol notation( or in words if symbol is not appropriate) (a) Z test (b)single sample t test (c)dependent t test (d) independent t test (e) Pearson correlation coeffieient. (f) ANOVA (g) chi Square goodness  of fit test (h)Chi Square test of independence  (i) Ho: u1-u2=0     H1: u1-u2!=0 (j) Ho: u1-u2 =0     H1:u1-u2<0 (k) Ho: u1-u2 >= 0      H1: u1=u2<0 (l) Ho : Rho=0     H1: Rho!=0 (m) Ho: Rho >= 0       H1: Rho <0 (n) Ho:Rho <= 0      H1: Rho >…

A refrigerator manufacturer claims that the mean life of its refrigerators is greater than 13 years. You are asked to perform a hypothesis test to test this claim. (a) How would you write the null and alternative hypothesis if you represent the manufacturer and want to support the claim? (b) How would you write the null and alternative hypothesis if you represent the competitor and want to reject the claim? (a) Ho: V 13 Ha: V 13 (b) Ho: V 13 Ha: 13 Click to select your answer(s). MacBook

Español On their website, a property management company states that the mean monthly rent for apartments on the east side of town is $725. A researcher for a consumer advocacy group believes that, due to the construction of newer apartment complexes in neighboring towns, the mean monthly rent on the east side, µ, is now lower. A random sample of 22 monthly rents for apartments on the east side has a mean of $715, with a standard deviation of $19. Assume that current monthly rents for apartments on the east side are approximately normally distributed. Based on the sample, is there enough evidence to conclude, at the 0.05 level of significance, that the population mean monthly rent is now less than what is stated on the website? Perform a one-tailed test. Then complete the parts below. Carry your intermediate computations to three or more decimal places. (If necessary, consult a list of formulas.)