Question: A random sample of 25 items is drawn from a population whose standard deviation is known to be = 40. The sample mean is

A random sample of 25 items is drawn from a population whose standard deviation is known to be σ = 40. The sample mean is x-bar = 270.
a. Construct an interval estimate for with 95 percent confidence.
b. Repeat part a assuming that n 5 50.
c. Repeat part a assuming that n 5 100.
d. Describe how the confidence interval changes as n increases.

Step by Step Solution

★★★★★

3.18 Rating (157 Votes )

There are 3 Steps involved in it

1 Expert Approved Answer

Step: 1 Unlock

a or 25432 28568 b 25... View full answer

Question Has Been Solved by an Expert!

Get step-by-step solutions from verified subject matter experts

Step: 2 Unlock

Step: 3 Unlock

Document Format (1 attachment)

485-M-S-S-D (1597).docx

120 KBs Word File

Students Have Also Explored These Related Statistics Questions!

A random sample of 100 items is drawn from a population whose standard deviation is known to be = 50. The sample mean is x-bar = 850. a. Construct an interval estimate for with 95 percent...

A random sample of 25 values is drawn from a mound-shaped and symmetrical distribution. The sample mean is 10 and the sample standard deviation is 2. Use a level of significance of 0.05 to conduct a...

A random sample of 25 years between 1890 and 2011 was obtained, and the amount of snowfall, in inches, for Memphis was recorded. Use a normal probability plot to assess whether the sample data could...

Help please 6 A random sample of 25 items is drawn from a population whose standard deviation is unknown. The sample mean is = 850 and the sample standard deviation is s= 15. Use Appendix D to find...

A random sample of 10 items is drawn from a population whose standard deviation is unknown. The sample mean is x-bar = 270 and the sample standard deviation is s = 20. Use Appendix D to find the...

A random sample of 27 items is drawn from a population whose standard deviation is unknown. The sample mean is Xbar = 940 and the sample standard deviation is s = 15. Use Appendix D to find the...

A random sample of 25 items is drawn from a population whose standard deviation is unknown. The sample mean is x-bar = 850 and the sample standard deviation is s = 15. Use Appendix D to find the...

I need C. Only Check m A random sample of 25 items is drawn from a population whose standard deviation is unknown. The sample mean is I = 850 and the sample standard deviation is s = 15. Use Appendix...

A random sample of 25 items is drawn from a population whose standard deviation is unknown. The sample mean is xx = 850 and the sample standard deviation is s = 15. Use Appendix D to find the values...

please help A random sample of 25 items is drawn from a population whose standard deviation is unknown. The sample mean is = 850 and the sample standard deviation is s = 15. Use Appendix D to find...

The costs of a company's call center for a number of recent months are listed below: April May June July August September October November Calls Taken Call Center Cost $ 73,732 6,801 6,770 $ 73,530...

Don Campbell and his younger brother, Edward, purchased Camp-bell Brewery from their father in 1983. The brewery makes and bottles beer under two labels and distributes it throughout the Southwest....

Should Kellogg have walked away from the Nigerian LNG project once it became clear that the payment of bribes might be required to secure the contract?

According to AASB 116, would you expense or capitalise expenditure incurred in repairing an asset? Explain your answer. LO 4.2, 4.3

Which of the following describe discrete data? a. The numbers of people surveyed in each of the next several Gallup polls b. The exact heights of individuals in a sample of several statistics...

In Data Set 5 in Appendix B, blood lead levels are represented as 1 for low, 2 for medium, and 3 for high. The average (mean) of the 121 blood lead levels is 1.53. Identify the level of measurement...

For each of the following, categorize the nature of the data using one of these three descriptions: (1) Discrete because the number of possible values is finite; (2) discrete because the number of...

A cable is attached to bar OA and point A as shown. The tension in the cable is F = 250 N. Part A 4 m Resolve for F into its vector components. Express your answer to three significant figures...

ST3.1 A judge denied a 94-year-old woman's attempt force the Massachusetts Lottery Commission to ay her entire $5.6 million winnings up front on the grounds that she otherwise won't live long enough...

Which of the following statements is NOT CORRECT? Answer Commercial paper can be issued by virtually any firm so long as it is willing to pay the going interest rate. Accruals are "free" in the sense...