The following table presents numbers of cucumber seeds, by brand, that germinate

Question

The following table presents numbers of cucumber seeds, by brand, that germinated or failed to germinate 14 days after planting. Can you conclude that the the germination rate is related to the brand of seed? Use the alpha = 0.01 level of significance. A) Reject H_0. It appears that the n rates differ among the seed brands. B) Do not reject H_0. There is insufficient evidence to conclude that the germination rate differs among the seed brands. The following table presents the numbers of customers who -after 2 weeks of use were satisfied or dissatisfied with their newly-purchased computers. Can you conclude that the the satisfaction rate is related to the brand of computer Use the alpha = 0.05 level of significance. The summary statistics for a certain set of points are: n = 16, s_e = 2.638, Sum(x - x^bar)^2 = 17.094, and b_1 = 1.408. Assume the conditions of the linear model hold. A 99% confidence interval for beta_1 will be constructed. What is the critical value? 2.977 2.602 2.947 2.624

Explanation / Answer

9) here at 0.01 level and 3 degree of freedom; critical value =11.3449

as test stat 11.6446 is greater then critical value

option A is correct

10)

at 0.05 level and 3 degree of freedom; critical value =7.8147

as test stat 13.5356 is greater then critical value we reject null hypothesis and conclude that there is a relation between satisfaction rate and Brand of computer.

11)critical value at (n-2=14) degree of freedom and 99% CI =2.977

option A is correct

Observed O brand A brand b brand C brand D Total germinated 44 33 35 31 143 failed to 10 9 2 17 38 Total 54 42 37 48 181 Expected E=rowtotal*column total/grand total brand A brand b brand C brand D Total germinated 42.663 33.182 29.232 37.923 143 failed to 11.337 8.818 7.768 10.077 38 Total 54 42 37 48 181 chi square =(O-E)^2/E brand A brand b brand C brand D Total germinated 0.042 0.0010 1.1381 1.2637 2.445 failed to 0.158 0.004 4.283 4.756 9.200 Total 0.200 0.005 5.421 6.019 11.6446

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