In a sample of n=3,600 students, the average GPA was x⎯⎯=3.5 with a sample variance of...

In a sample of n=3,600 students, the average GPA was x⎯⎯=3.5 with a sample variance of s2=0.25. Calculate the 98% confidence interval for the population GPA μ

The formula for the confidence interval is

Question 2 options:

	x±zα2/×s2n
	x±zα2/×sn
	x±zα2/×s2n√
	None of the above.

Solutions

Expert Solution

Please like ?

orchestra answered 1 year ago

Next > < Previous

Related Solutions

A sample of university students has an average GPA of 2.78 with a standard deviation of...

A sample of university students has an average GPA of 2.78 with a standard deviation of 0.45. If GPA is normally distributed, what percentage of the students has GPAs….. More than 2.3? Less than 3.0? Between 2.00 and 2.5?

The average GPA of a random sample of 18 college students who take evening classes was...

The average GPA of a random sample of 18 college students who take evening classes was calculated to be 2.94 with a standard deviation of 0.04. The average GPA of a random sample of 12 college students who take daytime classes was calculated to be 2.89 with a standard deviation of 0.05. Test the claim that the mean GPA of night students is larger than the mean GPA of day students at the .01 significance level. Claim: Select an answer...

x 3.5 1.4 27.3 9.2 11.6 14.1 Calculate the standard deviation and variance of the sample...

x 3.5 1.4 27.3 9.2 11.6 14.1 Calculate the standard deviation and variance of the sample data shown, to two decimal places x 3.5 1.4 27.3 9.2 11.6 14.1 Standard deviation: Variance:

a. Is the average GPA of all currently enrolled students at the University of Florida an...

a. Is the average GPA of all currently enrolled students at the University of Florida an example of a parameter or a statistic? b. Is the number of magazines read last year by a collection of people an example of a discrete or continuous variable? c. Are cat breeds an example of a quantitative or a qualitative variable? d. What is the difference between a simple random sample and a stratified random sample?

A study of 100 students in a local university gave the average GPA to be 3.1...

A study of 100 students in a local university gave the average GPA to be 3.1 with a standard deviation of.5. The same study revealed that in this sample, 20% are out of state students. 1. The lower bound, correct up to 3 decimal places for a 92% confidence interval for the actual GPA of students in this university is 2. The lower bound, correct up to 3 decimal places of a 90% confidence interval for the true proportion of...

study of 100 students in a local university gave the average GPA to be 3.1 with...

study of 100 students in a local university gave the average GPA to be 3.1 with a standard deviation of.5. The same study revealed that in this sample, 20% are out of state students. Question 1 100 students, the critical value at alpha=.06, to test the hypothesis that the true mean GPA is different from 3.0 is............. , while the test statistic value, correct up to 2 decimal places is................. Question 2 the same study with 100 students, the critical...

PROBLEM 3 The average grade point average (GPA) of undergraduate students in New York is normally...

PROBLEM 3 The average grade point average (GPA) of undergraduate students in New York is normally distributed with a population mean of 2.8 and a population standard deviation of 0.75 (I) The percentage of students with GPA's between 2 and 2.5 is CHOICE = (II) The percentage of students with GPA's above 3.0 is: PERCENTAGE = (III) Above what GPA will the top 5% of the students be (i.e., compute the 95th percentile): GPA = (IV) If a sample of...

(a) Show that the sample variance s 2 = [Pn i=1(xi − x¯) 2 ]/(n −...

(a) Show that the sample variance s 2 = [Pn i=1(xi − x¯) 2 ]/(n − 1) can also be expressed as s 2 = [Pn i=1 x 2 i − ( Pn i=1 xi) 2 n ]/(n − 1). At a medical center, a sample of 36 days showed the following number of cardiograms done each day. 25 31 20 32 20 24 43 22 57 23 35 22 43 26 56 21 19 29 36 32 33 32...

Below are a set of heights (in inches) and GPA scores for a sample of 6 students.

Below are a set of heights (in inches) and GPA scores for a sample of 6 students.Height, GPA60, 4.055, 3.262, 3.758, 3.949, 2.461, 2.8 a) Find the correlation coefficient (r) for these two variables by hand b) Find the mean and standard deviation for each variable. c) Find the equation of the regression line to predict GPA from height by hand d) Based on this data, what is the GPA prediction for a student who is 56 inches tall?...

A random sample n=30 is obtained from a population with unknown variance. The sample variance s2...

A random sample n=30 is obtained from a population with unknown variance. The sample variance s2 = 100 and the sample mean is computed to be 75. Test the hypothesis at α = 0.05 that the population mean equals 80 against the alternative that it is less than 80. The null hypothesis Ho: µ = 80 versus the alternative H1: Ho: µ < 80. Calculate the test statistic from your sample mean. Then calculate the p-value for this test using...

Subjects