# statistics

A student claims the average amount of time spent studying for an exam is less than or equal to 120 minutes. A random sample of 101 students is drawn from a normal distribution. The sample mean is 140 with a sample standard deviation of 20. Test the claim with a .01 level of significance and write your conclusion

1. 👍 0
2. 👎 0
3. 👁 66
1. Z = (mean1 - mean2)/standard error (SE) of difference between means

SEdiff = √(SEmean1^2 + SEmean2^2)

SEm = SD/√n

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/probability related to the Z score.

1. 👍 0
2. 👎 0
posted by PsyDAG

## Similar Questions

1. ### statistics

4. A college student is interested in whether there is a difference between male and female students in the amount of time spent studying each week. The student gathers information from a random sample of male and female students

asked by Ashley on October 1, 2012
2. ### statistics

4. A college student is interested in whether there is a difference between male and female students in the amount of time spent studying each week. The student gathers information from a random sample of male and female students

asked by Ashley on October 1, 2012
3. ### Discrete Mathematics

A tutor website wants to see how time spent studying for its content exams affects the ultimate scores. It asked its finite math test takers how much time they spent studying for the exam and compared that data against the final

asked by Joy on July 30, 2013
4. ### Discrete Mathematics

3. A tutoring site wants to see how time spent studying for its content exams affects the ultimate scores. It asked its finite math test takers how much time they spent studying for the exam and compared that data against the

asked by Joy on July 30, 2013
5. ### Pre-Cal (Math)

An instructor has determined that students' grads on the final exam depend on the amount of time, t, they spend studying for it and can be modeled by the formula g(t)=(21t+10)/(20t+45). Note that the function's output is a

asked by Gio on February 17, 2016
6. ### math ps. help

Time Spent Studying (in hours) The time spent studying, in hours, on a daily basis of 9 different students was used to create the box plot shown above. Which of the sets of times below matches the given box plot? Time Studying: 0,

asked by anthony awsome on January 22, 2014
7. ### Statistics

A survey among freshmen at a certain university revealed that the number of hours spent studying the week before final exams was normally distributed with mean 25 and standard deviation 15. A sample of 36 students was selected.

asked by Anonymous on June 20, 2013

Sheila spent x hours studying on a Tuesday and 1/4 hour studying on Thursday. What was the total amount of time in hours Sheila spent studying if x = 2/4? Do I add 1/4 + 2/4?

asked by Nessa on November 23, 2014
9. ### Math

Johnny spent 4 2/3 for his exams studying for his math exams. He spent 3/4 of the time studying for math. How many hours did Johnny spend stydying for his exam? How do I show the number sentence?

asked by Alexa on November 2, 2015
10. ### Statistics

A survey among freshman at a certain university revealed that the number of hours spent studying the week before final exams was normally distributed with mean 25 and standard deviation 15. A sample of 36 students was selected.

asked by Tommy on October 6, 2015

More Similar Questions