QUESTION 12 Hospital floors are usually covered by bare tiles. Carpets would cut

Question

QUESTION 12 Hospital floors are usually covered by bare tiles. Carpets would cut down on noise but might be more likely to harbor germas. To study this possibility, investigators randomly assigned 8 of 16 available hospital rooms to have carpet installed. The others were left bare. Later, air from each room was pumped over a dish of agar The dish was incubated for a fixed period, and the number of bacteria colonies were counted. What is the response variable in this situation? O A how much noise is refiected by the floor covering o B the room number in the sample . number of bacterial colonies counted o D carpeting or bare floors QUESTION 13 We have the geography test scores from a random sample of 100 fith grade students. We want to identity the most plausble values for the mean geography scone for al tth grade students What statistical analysis technique best coresponds to this shuation? O A Calculate a confidence interval for the average geography scoe in the population of th grade students O B Compute the linear correlation O C Perform a two-proportion inference test oD Perform a one-proportion interence fest QUESTION 14 We want to determine if high school boys who have been arested onoe score above the average for al lus high school boys on a standarcdzed scale of agreessiveness. What stañsical analysis technique best corresponds to this situation? O A Perform a two-mean inference test OB Calculate a contidence interval for the average geography score in the population of 1ith grade students O C Compute the linear correlation o D Pertorm a one-mean interence test

Explanation / Answer

QUESTION 13:

Correct option:

A.   Calculate a confidence interval for the average geography score in the population of fifth grade students

QUESTION 14:

Correct option:

D.   Perform a one - mean inference test.

QUESTION 15:

Correct option:

D. Perform a two - mean inference test.

QUESTION 16:

Correct option:

B. Skwewed to the right.

QUESTION 17:D.   Changing the units of measurements of the explanatory or response variable does not change the vaue of correlation.

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