1.The EPA claims that fluoride in children’s drinking water should be at a mean level of less than 1.2 ppm, or parts per million, to reduce the number of dental cavities. Identify the Type I error. (Points : 1)
[removed] Fail to support the claim σ < 1.2 when σ < 1.2 is true. [removed] Support the claim μ < 1.2 when μ = 1.2 is true. [removed] Support the claim σ < 1.2 when σ = 1.2 is true. [removed] Fail to support the claim μ < 1.2 when μ < 1.2 is true.
2. Medical researchers studying two therapies for treating patients infected with Hepatitis C found the following data. Assume a .05 significance level for testing the claim that the proportions are not equal. Also, assume the two simple random samples are independent and that the conditions np ≥ 5 and nq ≥ 5 are satisfied.
Therapy 1
Therapy 2
Number of patients
39
47
Eliminated Hepatitis
20
13
C infection
Find the z test statistic. Give your answer with two decimals, e.g., 9.87 . (Points : 0.5)
3. Scientists, researching large woody debris (LWD), surveyed the number of LWD pieces from aerial photos taken annually for the past 35 years at two different sites. Over the 35 years of photos examined, the first site had a mean number of LWD pieces per hectare per year (LWD/ha/yr) of 3.7 pieces with a standard deviation of 1.9. The second site had a mean number of LWD/ha/yr of 4.3 with a standard deviation of 2.4. Assume a .05 significance level for testing the claim that the mean LWD/ha at the first site had less than the mean LWD/ha/yr at the second site. Also, assume the two samples are independent simple random samples selected from normally distributed populations, but do not assume that the population standard deviations are equal.
Find the t test statistic. Give your answer with two decimals, e.g., 9.87 (Points : 0.5)
[removed]
4. The paired data consist of the cost of regionally advertising (in thousands of dollars) a certain pharmaceutical drug and the number of new prescriptions written (in thousands).
Cost
9
2
3
4
2
5
9
10
Number
85
52
55
68
67
86
83
73
Find the value of the linear correlation coefficient r . Give your answer to three decimals, e.g., .987 . (Points : 0.5)
[removed]
5. Use a .05 significance level and the observed frequencies of 70 Neonatal deaths to test the claim that number of neonatal deaths on each day of the week is equally likely.
Mon
Tues
Wed
Thurs
Fri
Sat
Sun
10
9
5
8
15
12
11
Determine the value of the χ2 test statistic. Give your answer to two decimals, e.g., 12.34 . (Points : 0.5)
[removed]
6. Using a .01 significance level, test the claim that the proportions of fear/do not fear responses are the same for male and female dental patients.
Gender
Male
Female
Fear Dentistry
48
70
Do Not Fear Dentistry
21
32
Do you reject the null hypothesis, at the .01 significance level? Enter Y for yes (reject), N for no (fail to reject). (Points : 0.5)
[removed]
7. The table represents results from an experiment with patients afflicted in both eyes with glaucoma. Each patient was treated in one eye with laser surgery and in the other eye was treated with eye drops. Using a .05 significance level, apply McNemar’s test to test the following claim: The proportion of patients with no improvement on the laser treated eye and an improvement on the drops treated eye is the same as the proportion of patients with an improvement on the laser treated eye and no improvement on the drops treated eye.
Eye Drop Treatment
Improvement
No Improvement
Laser Surgery
Improvement
15
10
Treatment
No Improvement
50
25
Do you reject the null hypothesis, at the .05 significance level? Enter Y for yes (reject), N for no (fail to reject). (Points : 0.5)
[removed]
8. For a study on Type 1 diabetes, medical graduate students subdivided the United States into four study regions (Northeast, Southeast, Southwest, and Northwest). The students randomly selected seven patients per region and recorded the number of times during a randomly selected month that each patient used insulin shots to regulate blood sugar levels. Use One-Way ANOVA at a .05 significance level to test the claim that the means from the different regions are not the same.
Mean number of times patients used insulin shots to regulate blood sugar levels
Northeast
Southeast
Southwest
Northwest
4
6
4
4
3
5
5
4
3
6
6
5
4
8
6
6
3
6
7
3
2
6
5
5
5
8
4
3
Determine the value of the F test statistic. Give your answer to two decimals, e.g., 12.34 . (Points : 0.5)
[removed]
9.
Assuming differences exist among the population means, the Bonferroni test can determine which population means differ from the others. (Points : 1)
[removed] True [removed] False
10. Use the following technology display from a Two-Way ANOVA to answer this question. Biologists studying habitat use in Lepidopteran moths measured the number of savannah moths found at three randomly selected prairie sites with two potential habitat interferences (expansion of row crops and grazing). Use a .05 significance level.
Source
Df
SS
MS
F
P
Site
2
.1905
.0952
.0381
.9627
Habitat
1
304.0238
304.0238
121.6095
.0000
Site*Habitat
2
.1905
.0952
.0381
.9627
What is the value of the F test statistic for the site effect? (Points : 0.5)
[removed]
What Students Are Saying About Us
.......... Customer ID: 12*** | Rating: ⭐⭐⭐⭐⭐"Honestly, I was afraid to send my paper to you, but you proved you are a trustworthy service. My essay was done in less than a day, and I received a brilliant piece. I didn’t even believe it was my essay at first 🙂 Great job, thank you!"
.......... Customer ID: 11***| Rating: ⭐⭐⭐⭐⭐
"This company is the best there is. They saved me so many times, I cannot even keep count. Now I recommend it to all my friends, and none of them have complained about it. The writers here are excellent."
"Order a custom Paper on Similar Assignment at essayfount.com! No Plagiarism! Enjoy 20% Discount!"
