statistics

posted by .

based on a random sample of 640 college students, the mean amount of sleep college students. construct a 95% confidence interval for the mean amount of sleep per night for college studenrs.

  • statistics -

    Formula:

    CI95 = mean + or - 1.96(sd/√n)
    ...where + or - 1.96 represents the 95% interval using a z-table, sd = standard deviation, and n = sample size.

    Fill in the data and calculate the interval.

  • statistics -

    1) A sample of 49 observations is taken from a normal population. The sample mean is 55 and the sample standard deviation is 10. Determine the 99% confidence interval for the population mean.

    2) The Fox TV network is considering replacing one of its primetime crime investigation shows with a new family-oriented comedy show. Before a final decision is made, network executives commission a sample of 400 viewers. After viewing the comedy, 250 indicated they would watch the new show and suggested it replace the crime investigation show.

    A) Estimate the value of the population proportion.
    B) Compute the standard error of the proportion.
    C) Develop a 99% CI for the population proportion.
    D) Interpret your findings

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. Math

    According to a student project for statistics 250, the amount of money spent on texts per semester by the population of students at a small liberal arts college is normally distributed with a mean of $426 and a standard deviation of …
  2. Math please help!

    According to a student project for statistics 250, the amount of money spent on texts per semester by the population of students at a small liberal arts college is normally distributed with a mean of $426 and a standard deviation of …
  3. Math-Statistics

    A marketing research company needs to estimate which of two soft drinks college students prefer. A random sample of n college students produced the following 98% confidence interval for the proportion of college students who prefer …
  4. statistics

    College students average 7.8 hours of sleep per night with a standard deviation of 45 minutes. If the amount of sleep is normally distributed, what proportion of college students sleep for more than 9 hours?
  5. Statistics

    I am not sure how to even get started on this question could someone help please. A college advisor wants to estimate the mean annual income of all college students who graduated last year. It is believed that the incomes follow a …
  6. statistics

    A random sample of 36 statistics students were asked to add a column of numbers. The amount of time required to compute the sum was recorded for each student. The sample mean time was 54 seconds with a sample standard deviation of …
  7. AP Statistics

    A school psychologist reports that the mean number of hours the students at this school sleep each night is 8 hours. The students believe the mean is not 8 hours. To find an estimate of the true mean, they select a random sample of …
  8. statistics

    The typical amount of sleep per night for undergraduate college students has a bell shaped distribution with a mean of 7 and a standard deviation of 1.90 hours. Based on this distributional information we can conclude that at least …
  9. Statistics

    You want to know if there's a difference between the proportions of high school students and college students who read newspapers regularly. out of a random sample of 500 high-school students, 287 say they read newspapers regularly, …
  10. statistics

    The number of hours that college students sleep on a week night is approximated by a normal curve with a mean of 7 hours and a standard deviation of 1.7 hours. Answer the question below using a z table: On a week night, what percentage …

More Similar Questions