Ask Question
MathematicsMathematics
10 November, 16:24

You are told that in a sample of size 225 the mean is 48.5 and the standard deviation is 1.8. The study is reported with 90% confidence level. Explain how to determine if 48.8 is within the confidence interval.

CL (%); 90, 95, 99

z*score:1.645, 1.96, 2.58

+2
Answers (2)
  1. 10 November, 16:34
    0
    To find the margin of error, multiply the z-score by the standard deviation, then divide by the square root of the sample size.

    The z*-score for a 90% confidence level is 1.645. The margin of error is 0.20.

    The confidence interval is 48.3 to 48.7.

    48.8 is not within the confidence interval.
  2. 10 November, 16:49
    0
    To find the margin of error, multiply the z-score by the standard deviation, then divide by the square root of the sample size. The z*-score for a 90% confidence level is 1.645. The margin of error is 0.20. The confidence interval is 48.3 to 48.7.48.8 is not within the confidence interval.
Know the Answer?
Not Sure About the Answer?
Find an answer to your question 👍 “You are told that in a sample of size 225 the mean is 48.5 and the standard deviation is 1.8. The study is reported with 90% confidence ...” in 📗 Mathematics if the answers seem to be not correct or there’s no answer. Try a smart search to find answers to similar questions.
Search for Other Answers
You Might be Interested in
1 bird is yellow 5 are blue, how many birds are there in total?
Answers (2)
A number increases by 10%, and then decreases by 10%. will the result be greater than, less than, or equal to the original number? explain.
Answers (2)
Write an algebraic rule to describe the translation P (-8, 6)
Answers (1)
The congruency of △MNO and △XYZ can be proven using a reflection across the line bisecting OZ. However, this congruency can also be proven using geometric postulates, theorems, and definitions.
Answers (1)
Maria said the 4 in 400,000 has a value of 400 is maria correct explain
Answers (1)
New Questions in Mathematics
Twenty milligrams of the drug lincomycin is to be given for each kilogram of a person's weight. The drug is to be mixed with 250 cc of a normal saline solution, and the mixture is to be administered intravenously over a 1 hour period.
Answers (1)
In the diagram below, QRS is an equilateral triangle and RT QS.
Answers (1)
What is the solution of this system of linear equations? y=2x-3 2x=y-3 a. infinitely many solutions b. (0, - 3) c. (0,0) d. no solution
Answers (1)
In calm waters, the oil spilling from the ruptured hull of a grounded tanker spreads in all directions.
Answers (1)
When does a barbershop quartet have 16 legs?
Answers (1)
Home » Mathematics » You are told that in a sample of size 225 the mean is 48.5 and the standard deviation is 1.8. The study is reported with 90% confidence level. Explain how to determine if 48.8 is within the confidence interval. CL (%); 90, 95, 99 z*score:1.645, 1.
Sign Up Forgot Password?