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Adults aged 18 years old and older were randomly selected for a survey on obesity. Adults are considered obese if their body mass index (BMI) is at least 30. The researchers wanted to determine if the proportion of women who are obese in the south is less than the proportion of southern men who are obese. The results are shown in Table 10.27. Test at the 1% level of significance.


Number who are obeseSample size
Men42769155,525
Women67169248,775

Short Answer

Expert verified

(a) The null hypothesis is stated as follows: p1≤p2

(b) The alternate hypothesis is stated as follows: p1>p2

(c) The disparity between male and female proportions is the random variable.

(d) Two proportions have a normal distribution.

(e) Fill in all requirements using Minitab's two-sample t-test option. Test statistics - 2.47

(f) p-value = 0.001

(g) i. α=0.01

ii. Decision: Null hypothesis not rejected

iii. p-value greater than α

iv. There is insufficient data to infer that the proportion of males who enjoy shopping for electronic equipment is greater than the proportion of women at the 5%level of significance.

Step by step solution

01

Given information

Given that, the significance level tested at 1%

02

Explanation

(a) The null hypothesis is stated as follows: p1≤p2

(b) The alternate hypothesis is stated as follows:p1>p2

(c) The disparity between male and female proportions is the random variable.

(d) Two proportions have a normal distribution.

(e) Fill in all requirements using Minitab's two-sample t-test option.

03

Step 3: 

Test and CI for two proportions

SampleXNSample P
1427691555250.274998
2671692487750.269999

Difference is p(1)−p(2)
Estimate for difference: 0.00499859
95 CI difference: (0.00217582,0.00782136)
Difference isp(1)−p(2)
Estimate for difference:0.00499859
95 s CI for difference is (0.00217582,0.00782136)
Test for difference =0( vs not =0):2=3.47

P-Value is 0.001
Fisher's exact test: P-Value=0.001
Test statistics3.47

04

Step 4: 

(f) p-value is 0.001

(g)

05

Step 5: 

i) α=0.01

ii) Decision: Null hypothesis not rejected .

iii) p>α.

iv) There is insufficient data to infer that the proportion of males who enjoy shopping for electronic equipment is greater than the proportion of women at the5% level of significance.

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