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Chapter 8: Q 33 (page 478)

The 95% confidence interval is:__________________.

Short Answer

Expert verified

The 95% confidence interval is [24.52,36.28]

Step by step solution

01

Given Information

The sample mean is 30.4minutes, that is, x¯=30.4

The random sample of 25 winter students was selected, that is, n=25

The population standard deviation is 15, that is, σ=15

we have to find the 95% confidence interval

02

Calculation 1

Now calculate the confidence interval using TI83 calculator using the steps given below,

Step 1: Press STAT and use the arrow (?) to TESTS.

Step 2: Now press the arrow ( ↓)to 7 : ZInterval and press enter.

Step 3: Then use the arrow (→)to STATS and press enter.

03

Step  3 Calculation 2

Step 4: Now press the arrow (?) and enter the inputs as shown below,

04

Calculation 3

Step 5: Then press the arrow (?) to calculator and press enter. The output is given below,

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Most popular questions from this chapter

Of 1,050 randomly selected adults, 360 identified themselves as manual laborers, 280 identified themselves as non-manual wage earners, 250 identified themselves as midlevel managers, and 160 identified themselves as executives. In the survey, 82% of manual laborers preferred trucks, 62% of non-manual wage earners preferred trucks, 54% of mid-level managers preferred trucks, and 26% of executives preferred trucks

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Construct a 95%confidence interval for the true mean number of colors on national flags.

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