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 TwoWay 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]