A middle school times its students on a one-mile race every year. A PE teacher w

Question

A middle school times its students on a one-mile race every year. A PE teacher wonders how much difference there might be in running times from 7th grade to 8th grade. The teacher finds the records of a random sample of 36 students currently in 8th grade, and contrasts their one mile times in 7th and 8th grade. Which inference procedure should be used? 1 point O A: one sample or matched-pairs t procedure for a mean B: two sample t procedure for two means C: ANOVA for several means D: z procedure for a proportion E:chi-square for two-way tables . Overweight, sedentary adults (155) were randomized into one of 3 eight-month exercise training groups: resistance training, aerobic training, resistance plus aerobic training. The primary outcome variable was the amount of visceral fat (in cm2) assessed via CT scan at the end of the study. Which inference procedure should be used? 1 point O A: one sample or matched-pairs t procedure for a mean B: two sample t procedure for two means C:ANOVA for several means D: z procedure for a proportion E:chi-square for two-way tables

Explanation / Answer

(first part) B. two sample t procedure for two means

here we want to test equality of two means ( student of 7th and 8th grade )

for this we use two sample t-test for equality of two sample means

(second part) C.ANOVA for several means

here we want to test the equality of more than two means ( resistance,aerobic and resistance+aerobic).

for this hypothesis test we use One-way anova

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