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]
