21. worldwide, 21% of the human population has Type A blood. Findings of some st

Question

21. worldwide, 21% of the human population has Type A blood. Findings of some studies show that the proportion of Americans having Type A blood is greater than that. We collect blood types data from a random sample of Americans and conduct a hypothesis test: Ho: Ptye-0.21 vs. H. : Pnpe.> 0.21. The P-value for the calculated test statistic is 0.023. Based on the obtained P-value (0.023) and the level of significance (a) set at 0.05, one should conclude that the: a. percentage of people with Type A blood is the same for Americans and worldwide, (Ho is accepted.) b. finding is inconclusive. Ho is neither accepted nor rejected c. percentage of Americans with Type A is significantly differ from world population, (Ho is rejected.) None of the above. d. 22. The analysis of variance methodology shows the difference between the means of several groups is real (significant) when a. the variance within groups is significantly larger than the variance between (among) groups. b. the variance between (among) groups is significantly larger than the variance within groups. c. the sum squares within groups equals the total sum squares d. a and b. 23. When using the Chi-square (x) method of analysis to test for the differences among three or more proportions, the degrees of freedom is equal to a. n-1 c. (r-1(c-1) d. (r1)+ (c-1) 24. In regression analysis, the idea of the "best fitted line" means to find the line for which the sum squared differences (residual) betweenis as small as possible: a. x, and y b. x and c. Fand d. y and y 25. Which of the following statements is false? a. Ho refers to a specific value of the population parameter. b· The statement of Ho may contain equality c. The statement of Ha may contains inequality. d. Ho refers to a specific value of the sample statistic. 6. 32. 51011 1011-0

Explanation / Answer

24) actual values - estimated values

Option d

25) option d

H0 refers to a specific value of the sample statistic

23) df = n-1

Option a

21) option c

Since p value < 0.05 so the result is significant.

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