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RUDIKE [14]
3 years ago
9

How much TV do college students watch? A survey of 361 students recorded the number of hours of television they watched per week

. The sample mean was 6.504 hours with a standard deviation of 5.584. The standard error of the mean was 0.294. Find a 90% confidence interval for the population mean. Round your answer to three decimal places
Mathematics
1 answer:
Darina [25.2K]3 years ago
3 0

Answer: 90% confidence interval would be (6.022,6.986).

Step-by-step explanation:

Since we have given that

Number of students = 361

Sample mean = 6.504

Sample standard deviation = 5.584

Standard error of the mean = 0.294

At 90% confidence level,

So, α = 0.01

So, z = 1.64

Margin of error is given by

z\times \text{Standard error}\\\\=1.64\times 0.294\\\\=0.48216

So, Lower limit would be

\bar{x}-0.482\\\\=6.504-0.482\\\\=6.022

Upper limit would be

\bar{x}+0.482\\\\=6.504+0.482\\\\=6.986

So, 90% confidence interval would be (6.022,6.986).

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Simplify to create an equivalent expression. 2(-n-3)-7(5+2n)
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5 0
1 year ago
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If Luke pushes his sister in a wagon down the driveway that is 14 meters long and it takes 22 Newtons of force, how much work di
marusya05 [52]
<h2>Hello!</h2>

The answer is:

Luke did a work of 308N.m

<h2>Why?</h2>

The work appears when a force is applied on a object making it to move covering a distance. The movement caused by the force, will follow the same direction that the force.

We can calculate the work done by using the following equation:

Work=Force*distance*Cos(\alpha)

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