Question

1. A random sample of 500 students were collected to report the sample mean and standard deviation for high school grade point average (GPA) for students enrolled at WVU. The sample mean and standard deviation were 3.73 and 0.45, respectively. Assume the sample comes from an approximately Normal Distribution. A. Construct and interpret a 95% Confidence Interval for the mean high school GPA for students at this university. B. Construct and interpret a second 95% Confidence Interval for the mean high school GPA for students at this university, but this time assume n = 25. C. How many students must be sampled so that a 99% Confidence Interval specifies the mean high school GPA to within ± 0.02? (Hint: Use z table for Critical Value)

          1. A random sample of 500 students were collected to report the sample mean and standard deviation for high school grade point average (GPA) for students enrolled at WVU. The sample mean and standard deviation were 3.73 and 0.45, respectively. Assume the sample comes from an approximately Normal Distribution.
A. Construct and interpret a 95% Confidence Interval for the mean high school GPA for students at this university.
B. Construct and interpret a second 95% Confidence Interval for the mean high school GPA for students at this university, but this time assume n = 25.
C. How many students must be sampled so that a 99% Confidence Interval specifies the mean high school GPA to within ± 0.02? (Hint: Use z table for Critical Value)

1. A random sample of 500 students were collected to report the sample mean and standard deviation for high school grade point average (GPA) for students enrolled at WVU. The sample mean and standard deviation were 3.73 and 0.45, respectively. Assume the sample comes from an approximately Normal Distribution.
A. Construct and interpret a 95% Confidence Interval for the mean high school GPA for students at this university.
B. Construct and interpret a second 95% Confidence Interval for the mean high school GPA for students at this university, but this time assume n = 25.
C. How many students must be sampled so that a 99% Confidence Interval specifies the mean high school GPA to within ± 0.02? (Hint: Use z table for Critical Value)

Added by -Ngel S.

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