3. a. A sample of 38 students from a community college reveals the average number of...

3. a. A sample of 38 students from a community college reveals the average number of units they are taking is 11.5, with a standard deviation of 1.4. Determine a 98% confidence interval for the true mean. b. Assume now that the same results occurred from a sample of size 9, but it was known that the original population was normal. c. Repeat problem 3a, assuming that the standard deviation was the real population standard deviation.

Solutions

Expert Solution

orchestra answered 1 year ago

Next > < Previous

Related Solutions

In a simple random sample of 51 community college statistics students, the mean number of college...

In a simple random sample of 51 community college statistics students, the mean number of college credits completed was x=50.2 with standard deviation s = 8.3. Construct a 98% confidence interval for the mean number of college credits completed by community college statistics students. Verify that conditions have been satisfied: Simple random sample? n > 30? Find the appropriate critical value Since σ is unknown, use the student t distribution to find the critical value tα2 on table A-3 Degrees...

2. A simple random sample of 1oo community college students was selected from alarge community college....

2. A simple random sample of 1oo community college students was selected from alarge community college. The gender of each student was recorded, and each student was asked the following questions. 1. Have you ever had a part time job? 2. If you answered yes to the previous question, was your part-time job in the summer only? The responses are summarized in the table below. Job Experience · 'iINever had a part-time job F· -------··-·- -~--·-····- ---·---· -·--- ---- ....

The following table was generated from the sample data of 10 college students regarding the number...

The following table was generated from the sample data of 10 college students regarding the number of parking tickets the student receives in a semester, the student's age, and the student's GPA. The dependent variable is the student's GPA, the first independent variable (x1) is the number of parking tickets, and the second independent variable (x2) is the student's age. Intercept 2.120785 2.284291 0.928421 0.395800 Number of Parking Tickets -0.337479 0.066991 -5.037686 0.003975 Student's Age 0.127003 0.116260 1.092403 0.324473 Step...

A small community college claims that their average class size is equal to 35 students. This...

A small community college claims that their average class size is equal to 35 students. This claim is being tested with a level of significance equal to 0.02 using the following sample of class sizes: 42, 28, 36, 47, 35, 41, 33, 30, 39, and 48. Assume class sizes are normally distributed. (NOTE: We need to assume that class sizes are normally distributed in order to use the t distribution because the sample size n=10 < 25, and the Central...

The age distribution of students at a community college is given below. Age (years) Number of...

The age distribution of students at a community college is given below. Age (years) Number of Students (f) Under 21 416 21-25 420 26-30 219 31-35 51 Over 35 24 Total = 1130 Number of students (f) 416 420 219 51 24 1130 A student from the community college is selected at random. Find the conditional probability that the student is at most 35 given that he or she is at least 26.

In a sample of 1000 Yuba College students, it was found that they consumed on average...

In a sample of 1000 Yuba College students, it was found that they consumed on average 23 grams of sugar with a standard deviation of 4 grams and that 230 planned to transfer to Chico State. a) (7 points) Can we conclude with 99% confidence that Yuba College students consume on average over 20 grams of sugar? Use the rejection region approach. b) Can we conclude with 99% confidence that under 25% of Yuba College students plan to transfer...

A librarian claims that the mean number of books read per month by community college students...

A librarian claims that the mean number of books read per month by community college students is less than 2 books. A random sample of 28 community college student had read a mean of 2 books with a standard deviation of 2.14 books. Test the librarian’s claim at the 0.01 level of significance. State the hypotheses and identify the claim. Find the critical value(s) Compute the test value. Make the decision to reject or not reject the null hypothesis. Summarize...

3. Below is the number of texts per day for a random sample of students from...

3. Below is the number of texts per day for a random sample of students from last semester. (Population normal enough.) a. Create the 95% confidence interval for both sets of data. Is there evidence that the population means are different? Under 19 years old: 250, 15, 200, 10, 15, 50, 20, 150, 63, 15, 7, 20, 35, 4, 20 At least 19 years old: 100, 20, 40, 5, 30, 100, 100, 65, 5, 25, 20, 50, 10, 10 b....

A group of 100 of the 2,500 students enrolled in a college in natural sciences reveals...

A group of 100 of the 2,500 students enrolled in a college in natural sciences reveals that 35 are 17 years old, 45 are 18 years old, 10 are 19 years old, 6 are 20 years old, three are 21 years old and one is 22 years old. a)provide an estimate for the mean, variance and standard deviation for the Age of the group. b) Find the confidence interval with a confidence bands of 90% , 95% , and 99%...

3. The population of male students at Gallup (NM) Community College have a men height of...

3. The population of male students at Gallup (NM) Community College have a men height of 67.5 inches. It is claimed that male students who try out for the basketball team are taller than the general population of male students. To test this claim a sample of n= 36 male students who try out for the basketball team have a mean height of 68.3 inches and a standard deviation of 2.8 inches. Test this claim at the 90 and 99%...

Subjects