please help me solve six statistics problems, As soon as possible thank you.1
A medical clinic in a small city in the state of Washington wants to esTmate the mean serum
cholesterol level (measured in mg of cholesterol per 100 mL of blood) of teenage males. Based on the
following summary data taken from a random sample of 10 teenage males from this community,
compute a 90% conFdence interval for the mean serum cholesterol level of teenage males in this city.
Assume that the sample was taken from a normal distribuTon. Round your conFdence limits to 2
Summary Data: n = 10, x¯=223.562, s = 24.920
A. (207.15, 240.67)
B. (209.12, 238.01)
C. (210.12, 239.56)
D. (213.34, 242.83)
E. None of the above
Pschological tests are o±en used to determine the hosTlity levels in people. High scores on the HL²
pschological test corresponds to high hosTlity levels. Suppose that 26 college students, all with equally
high HL² test scores, were separated into two groups randomly. Group 1 (10 students) was treated for
high hosTlity levels by using Method A; whereas Group 2 (16 students) was treated for high hosTlity
levels by using Method B. Both groups were treated for a period of 5 months, at which Tme all 26
students were again given the HL² test. Below is the summary data on the HL² test for the two groups.
Group 1: sample mean is 79 and sample standard deviaTon is 7
Group 2: sample mean is 84 and sample standard deviaTon is 8 Compute a 95% conFdence level for the
di³erence in the means of the two treatment methods and select the best answer below. Assume that
the independent random samples were taken from normal distribuTons and that the two populaTon
variances are equal.
A. We are 95% conFdent that there is no staTsTcally signiFcant di³erence in the mean treatment
methods for hosTlity.
B. We are 95% conFdent that Method A is a be´er treatment for hosTlity than Method B.
C. We are 95% conFdent that Method B is a be´er treatment for hosTlity than Method A.
D. We are 95% conFdent that there is a staTsTcally signiFcant di³erence in the mean treatment methods
This question was answered on: May 23, 2022
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