The degenerative disease osteoarthritis most frequently affects weight-bearing joints such as the knee. Stance duration was measured in seperate samples of younger and older adults. Test the claim that the true average stance is different between younger and older adults

Younger: n = 22, xbar = 801, s =117

Older: n = 16, xbar = 780, s = 81

Let population 1 = younger

population 2 = older

what is the appropriate procedure to test the claim?

what is the degrees of freedom? Use the conservative formula

At 0.05 significance level, what is/are the critical value/s?

what is the value statistic?

what is the margin of error?

does the result of the confidence interval estimate aggrees with the hypothesis test

The degenerative disease osteoarthritis most frequently affects weight-bearing joints such as the knee. Stance duration (ms) was measured in separate samples of younger and older adults.

younger:

n=22

mean=801

s=117

older:

n=16

mean=780

s=81

Test the claim that the true average stance is different between younger and older adults.

Let

population 1= younger

population 2= older

a. What is the appropriate procedure to test the claim?

b.Construct a 95% confidence interval estimate, what is the margin of error? Use 2 decimal places.

The degenerative disease osteoarthritis most frequently affects weight-bearing joints such as the knee. Stance duration (ms) was measured in separate samples of younger and older adults.

younger:

n=22

mean=801

s=117

older:

n=16

mean=780

s=81

Test the claim that the true average stance is different between younger and older adults.

Let

population 1= younger

population 2= older

a. What is the appropriate procedure to test the claim?

b.What is the degrees of freedom? Use the conservative formula.

c.At 0.05 significance level, what is/are the critical value/s?

d.What is the value of the test statistic? Use 2 decimal places

e.Construct a 95% confidence interval estimate, what is the margin of error? Use 2 decimal places.

The degenerative disease osteoarthritis most frequently affects weight-bearing joints such as the knee. An article presented the following summary data on stance duration (ms) for samples of both older and younger adults.

Age | Sample Size | Sample Mean | Sample SD | |||
---|---|---|---|---|---|---|

Older | 29 | 809 | 116 | |||

Younger | 18 | 770 | 71 |

Assume that both stance duration distributions are normal.

(a) Calculate a 99% CI for true average stance duration among elderly individuals. (Round your answers to one decimal place.)

,

ms

Calculate the test statistic and determine the *P*-value. (Round your test statistic to one decimal place and your *P*-value to three decimal places.)

t | = | |

P-value | = |

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