# Statistics

the average length of time for students to register for fall classes at a certain college has been 50 minutes. a new registration procedure using modern computing machine is being tried. if a random sample of 12 students had an average registration time of 42 minutes with a standard deviation of 11.90 minutes under the new system, test the hypothesis that the population mean is now less than 50 using:a. 0.05 level of significance and b. 0.01 level of significance.

1. 👍 0
2. 👎 0
3. 👁 377
1. Z = (mean1 - mean2)/standard error (SE) of difference between means

SEdiff = √(SEmean1^2 + SEmean2^2)

SEm = SD/√(n-1)

If only one SD is provided, you can use just that to determine SEdiff.

Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportion related to the Z score.

1. 👍 0
2. 👎 0
2. 22

1. 👍 0
2. 👎 0

## Similar Questions

1. ### Math

Period 1 has 15 students in it and a test average of 86%. Period 2 has 21 students in it and an average of 88%. Period 3 has 12 students in it and an average of 95%. Use weighted means to find the overall average of the classes.

2. ### statistics

A sample of the number of study per week of college students is collected. Some of the sample results of the survey are given in the following table Study Hr 4, 10, 20,24, 34, 36, 42 Z score -2.5,-1.75,-0.5,0, 1.25,1.5,2.25 P.

3. ### Micro- Econ

Which of the following is a question answered with normative economic reasoning? A.If the college offers free textbooks for students, will more students read their textbooks? B.If the college provided less financial aid for

4. ### Statistics

A poll was taken of a random sample of 1189 college students. Of these students, 789 reported that they had a drinking binge (more than 10 drinks in an evening) in the past month. Select the most believable conclusion. A. About

1. ### Economics

Suppose a university decides to alter its tuition schedule by separating its students based on how many years of college they have completed. Most university programs require four years to complete. First-year students would get a

2. ### math

Greg teaches martial arts. He charges a one time processing fee of \$5.00 and the cost of classes are shown below. let x represent the number of classes and y represent the cost of the classes. Based on the information, what will

3. ### statistics

1. The exam scores for the students in an introductory statistics class are as follows. 88 63 90 64 82 98 96 75 89 86 76 84 70 67 34 89 85 39 81 96 92 85 a. Compute the mean and the median score. b. Identify the shape of the

4. ### my college essay part one

1. Academic preparation: How have you taken advantage of the educational opportunities you have had to prepare for college? I have taken advantage of the many great opportunities in my education to grow as a student and, most

1. ### Probability

Of the 1286 students enrolled at the community college last fall, 367 registered early. Based on this data which approach would be best to find the probability of students who will register early this fall? classical approach

2. ### college

Do students at various colleges differ in how sociable they are? Twenty-five students were randomly selected from each of three colleges in a particular region and were asked to report on the amount of time they spent socializing

3. ### statistics

The time needed to complete a final examination in a particular college course is normally distributed with a mean of 79 minutes and a standard deviation of 8 minutes. Answer the following questions. Assume that the class has 60

4. ### algebra

Miranda's financial aid stipulates that her tuition not exceed \$1200. If college charges a \$45 registration fee plus \$475 per course, what is the greatest number of courses for which Miranda can register. Miranda can register for