6

1. Boys of a certain age have a mean weight of 85 pounds. A complaint is made that in a municipal children's home the boys are underfed. As one bit of evidence, 25 of these boys are weighed and found to have a mean weight of 80.94 pounds and a sample standard deviation of 11.6 pounds. Is the complaint legitimate? What is the appropriate alternative hypthesis?
2. 1. < 85
3. 2. > 80.94
4. 3. > 85
5. 4. < 80.94

1 points

QUESTION 7

1. An ideal weight of a person is 60 kg. The mean weight of the sample of 100 persons from the Honolulu Heart Study is 64 kg. Are the people in the Honolulu study overweight?Assume that = 10 kg and = .05.What is the appropriate alternative hypothesis?
2. 1. < 60
3. 2. > 64
4. 3. > 60
5. 4. < 64

1 points

QUESTION 8

1. Boys of a certain age have a mean weight of 85 pounds. A complaint is made that in a municipal children's home the boys are underfed. As one bit of evidence, 25 of these boys are weighed and found to have a mean weight of 80.94 pounds and a sample standard deviation of 11.6 pounds. Is the complaint legitimate? Conduct a hypothesis test at a significance level of.05. What is the appropriate test statistic?
2. 1.z = 1.75
3. 2.t = -1.75
4. 3.z = -1.75
5. 4.t = 1.75

1 points

QUESTION 9

1. Boys of a certain age have a mean weight of 85 pounds. A complaint is made that in a municipal children's home the boys are underfed. As one bit of evidence, 25 of these boys are weighed and found to have a mean weight of 80.94 pounds and a sample standard deviation of 11.6 pounds. Is the complaint legitimate? Conduct a hypothesis test at a significance level of.05. What would a Type II error be?
2. 1.Concluding that the mean weight of boys at the municipal children's home is less than 80.94, when in fact it is at least 80.94.
3. 2.Concluding that the mean weight of boys at the municipal children's home is at least 85, when in fact it is less than 85.
4. 3.Concluding that the mean weight of boys at the municipal children's home is at least 80.94, when in fact it is less than 80.94.
5. 4.Concluding that the mean weight of boys at the municipal children's home is less than 85, when in fact it is at least 85.

1 points

QUESTION 10

1. An ideal weight of a person is 60 kg. The mean weight of the sample of 100 persons from the Honolulu Heart Study is 64 kg. Are the people in the Honolulu study overweight?Assume that = 10 kg and = .05.What is the appropriate test statistic?
2. 1.t = -4
3. 2.t = 4
4. 3.z = -4
5. 4.z = 4

1 points

QUESTION 11

1. An ideal weight of a person is 60 kg. The mean weight of the sample of 100 persons from the Honolulu Heart Study is 64 kg. Are the people in the Honolulu study overweight?Assume that = 10 kg and = .05.What is the appropriate critical value?
2. 1.t = 1.6602
3. 2.t = 1.984
4. 3.z = 1.645
5. 4.z = 1.28

1 points

QUESTION 12

1. State the null and alternative hypotheses for the following situation: Is the mean IQ of children who attend private school significantly above the normal IQ of 100?
2. 1.H₀: 100, H₁: > 100
3. 2.H₀: 100, H₁: = 100
4. 3.H₀: = 100, H₁: 100
5. 4.H₀: 100, H₁: < 100

2 points

QUESTION 13

1. A 95% confidence interval for is found to be (1.5, 1.6). A 99% confidence interval that is computed with the same sample information will
2. 1.be wider
3. 2.be more narrow
4. 3.have the same width as the 95% confidence interval
5. 4.can't tell