A researcher wishes to see if the average weights of newborn male infants are higher than the average weights of newborn female infants. She selects a random sample of 12 male infants and finds the mean weight is 7.70 pounds and the sample standard deviation is 0.50 pounds. She selects a random sample of 9 female infants and finds that the mean weight is 7.25 pounds and the sample standard deviation is 0.60 pounds. Assume that the variables are normally distributed and population variances are not equal. Using alpha=0.05 to test if the mean weight of the males is significantly higher than the mean weight of the females the value of the test statistic can be: Α.1.82 В.о C. 1.96 D.-1.96 E. 2.04 F. 2.15 G.-1.82

Calculus For The Life Sciences
2nd Edition
ISBN:9780321964038
Author:GREENWELL, Raymond N., RITCHEY, Nathan P., Lial, Margaret L.
Publisher:GREENWELL, Raymond N., RITCHEY, Nathan P., Lial, Margaret L.
Chapter13: Probability And Calculus
Section13.3: Special Probability Density Functions
Problem 7E
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A researcher wishes to see if the average weights of newborn male infants are higher than the average weights of
newborn female infants. She selects a random sample of 12 male infants and finds the mean weight is 7.70
pounds and the sample standard deviation is 0.50 pounds. She selects a random sample of 9 female infants and
finds that the mean weight is 7.25 pounds and the sample standard deviation is 0.60 pounds. Assume that the
variables are normally distributed and population variances are not equal. Using alpha=0.05 to test if the mean
weight of the males is significantly higher than the mean weight of the females the value of the test statistic can
be:
Α.1.82
В.о
C. 1.96
D.-1.96
E. 2.04
F. 2.15
G.-1.82
Transcribed Image Text:A researcher wishes to see if the average weights of newborn male infants are higher than the average weights of newborn female infants. She selects a random sample of 12 male infants and finds the mean weight is 7.70 pounds and the sample standard deviation is 0.50 pounds. She selects a random sample of 9 female infants and finds that the mean weight is 7.25 pounds and the sample standard deviation is 0.60 pounds. Assume that the variables are normally distributed and population variances are not equal. Using alpha=0.05 to test if the mean weight of the males is significantly higher than the mean weight of the females the value of the test statistic can be: Α.1.82 В.о C. 1.96 D.-1.96 E. 2.04 F. 2.15 G.-1.82
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