Question

# You are concerned that you did not sample the correct number of​ 5-year-olds. You know that...

You are concerned that you did not sample the correct number of​ 5-year-olds. You know that the standard deviation of all​ 5-year-old females' heights is 0.75 inches. You want to be​ 99% confident that the mean is correct within 0.25 inches.

How many​ 5-year-old females should you​ sample?

Is a sample of 80 large​ enough? Yes No

Solution :

Given that,

= 0.75

E = 0.25

At 99% confidence level the z is ,

= 1 - 99% = 1 - 0.99 = 0.01

/ 2 = 0.01 / 2 = 0.005

Z/2 = Z0.005 = 2.576

sample size = n = (Z/2* /E)2

= (2.576 * 0.75 / 0.25 )2

n= 59.72

n= 60

#### Earn Coins

Coins can be redeemed for fabulous gifts.

##### Need Online Homework Help?

Most questions answered within 1 hours.

##### Active Questions
• Implement the following circuit to test the characteristics of a D flip flop. Note: Using a...
• Next, suppose you add the unemployment rate, as a variable, to the regression model above and...
• In a recent random sample, where 600 adults were surveyed, 16.4% indicate that they have fallen...
• Suppose that you estimate the following regression: SALES = 5.467-1.034(PRICE) A) How do you interpret the...
• Consider the following scenario: An industrial seller of grass seeds packages its product in 50-pound bags....
• ​(Bond valuationlong dash—zero coupon​) The Latham Corporation is planning on issuing bonds that pay no interest...