A grower says the plants produced have a height greater or equal 7.3 inches with

Question

A grower says the plants produced have a height greater or equal 7.3 inches with s=0.5. We collect 20 trees at random and find an average of 7.2. Can you reject the claim (H0) at the level at the level of significance alpha=0.5? Fail to reject Ha Reject Ha Fail to reject H0 Reject H0 In order to get into a Master's program a University accepts all student in the top 20% in the GRE tests.. The average of the test is 567 pts, with a standard deviation of 40 pts. How many points I need to have (at least) in the test to be accepted in the Master's program? 601 500 567 650 For a normally distributed random variable with average 10 and standard deviation 9 find the critical values (a, b) corresponding to a confidence level of 68%. (10,20) (5,15) (0,20) (1,19)

Explanation / Answer

38) Compute 1-sample t test.

t=(xbar-mu)/(s/sqrt n)

=(7.2-7.3)/(0.5/sqrt 20)

=-0.89

p value is 0.1923.

p valu eis not less than alpha=0.05, fail to reject H0. (C)

39. From information given, Z=0.84, Xbar=567, s=40, find Xi

Z=(Xi-Xbar)/s

0.84=(Xi-567)/40

Xi=600.6~601 (A)

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