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Eye black Athletes performing in bright sunlight often smear black grease under their eyes to reduce glare. Does cye black work? In one experiment, 16 randomly selected student subjects took a test of sensitivity to contrast after 3 hours facing into bright sun, both with and without eye black. Here are the differences in sensitivity, with eye black mines without eye black:

0.070.64-0.12-0.05-0.180.14-0.160.03
0.050.020.430.24-0.110.280.050.29

We want to know whether cye black increases sensitivity an the average.

(a) State hypotheses, Be sure to define the parameter.

(b) Check conditions for carrying out a significance test.

(c) ThePvalueof the test is 0.047. Interpet this value in context.

- Interpret a Type l error and a Type ll error in context, and give the consequences of each.

- Understand the relationsonship between the significance level at a test P(Type li error), and power.

Short Answer

Expert verified

(a)H0:d=0

H:d>0

(b)Conditions for carrying out a significance test is satisfied

(c) It means that at an average 4.7%of athletes differ from the athletes whose eye black does not increase the sensitivity.

Step by step solution

01

Part (a) Step 1: Given Information 

Given in the question that

A significance test is performed to test the sensitivity with eye black and without eye black in athletes.

Sample size n=16. we have to State hypotheses, Be sure to define the parameter.

02

Part (a) Step 2: Explanation 

The differences in sensitivity with eye black minus without eye black are shown below:

0.070.64-0.12-0.05-0.180.14-0.160.03
0.050.020.430.24-0.110.280.050.29

Letddenote the average sensitivity differential between with and without eye black.

The average sensitivity of eye black is the parameter of interest. The test is carried out to see if the average sensitivity of eye black has increased.

H0:d=0

H:d>0

03

Part (b) Step1 : Given Information 

we have to Check conditions for carrying out a significance test.

04

Part (b) Step 2: Explanation 

The following are the requirements for conducting a paired test: 1. A random sample must be chosen.

2. No outliers should exist.

3. The observations are unrelated to one another, or the sample is no more than 10%of the total population.

The students in the sample were chosen at random.

There are no outliers in the data, as seen in the histogram below:

we know that there will be at least 160students who are athletes.so the 10%condition is also satisfied.

05

Part (c) Step 1: Given Information 

Given in the question that Pvalue=0.047we have to Interpret this value in context.

06

Part (c) Step 2: Explanation 

The Pvalue of the test is0.047It means that at an average 4.7%of athletes differ from the athletes whose eye black does not increase the sensitivity.

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