Unnithan, Houser, and Fernhall (2006) were interested in whether playing the game Dance Dance Revolution (DDR) affected the heart rate of overweight and non-overweight adolescents differently. A group of 22 adolescents, 10 classified as overweight and 12 as not overweight played DDR for 12 minutes, during which time the researchers measured each participant's heart rate. Which statistical test should the researchers use to analyze their data?A) independent-samples t testB) dependent-samples t testC) z testD) single-sample t test

dependent-samples t test

Step-by-step explanation:

Here we want to test the effect of game Dance Dance Revolution (DDR) on heart rate.

The hypothesis is

where,

Where Xi =  heart rate before playing the game Dance Dance Revolution (DDR)

Yi = heart rate after playing the game Dance Dance Revolution (DDR)

This test is paired t-test( dependent sample t test).

To measure the effect of experiment. (before - after condition)

10000

step-by-step explanation: divide by 2,

hello,

b) 62.47% of the students are between 14 and 18 years old.

step-by-step explanation:

mean = 15 and standard deviation = 2

student between 14 to 18

formula used z-score

for age 14 , z score

using z-table , p(z> -0.5)=0.3085

for age 18 , z score

using z-table , p(z< 1.5)=0.9332

p(-0.5< z< 1.5)=0.9332-0.3085 = 0.6247

thus, 62.47% of the students are between 14 and 18 years old.

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