Quiz | Mathematics homework help

Category: Mathematics

This is the 10 questions of the quiz:

 

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)       
      
      
      

 

Medical researchers reviewing the risk of death for elderly patients taking dementia drugs 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.

 

 

Dementia Drugs

Placebo

Number of patients

500

450

Total deaths

23

12

 
Find the z test statistic. Give your answer with two decimals, e.g., 9.87 . (Points : 0.5)       
      
      
      

 

Use a .05 significance level and the observed frequencies of 144 drownings at the beaches of a randomly selected coastal state to test the claim that the number of drownings for each month is equally likely.

 

Jan

Feb

Mar

Apr

May

June

July

Aug

Sept

Oct

Nov

Dec

1

3

2

7

14

20

37

33

16

6

2

3

 
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)       

 

 

Immune Modulator Cream

 

 

Cure

No Cure

Topical Steroid

Cure

25

11

Cream

No Cure

42

22

      
 

 

 

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]

 

 

 

 

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