1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
klio [65]
3 years ago
5

Toxaphene is an insecticide that has been identified as a pollutant in the Great Lakes ecosystem. To investigate the effect of t

oxaphene exposure on animals, groups of rats were given toxaphene in their diet. A study reports weight gains (in grams) for rats given a low dose (4 ppm) and for control rats whose diet did not include the insecticide. The sample standard deviation for 22 female control rats was 28 g and for 18 female low-dose rats was 51 g. Does this data suggest that there is more variability in low-dose weight gains than in control weight gains? Assuming normality, carry out a test of hypotheses at significance level 0.05.
Mathematics
1 answer:
Likurg_2 [28]3 years ago
8 0

Answer:

This data suggest that there is more variability in low-dose weight gains than in control weight gains.

Step-by-step explanation:

Let \sigma_{1}^{2} be the variance for the population of weight gains for rats given a low dose, and \sigma_{2}^{2} the variance for the population of weight gains for control rats whose diet did not include the insecticide.

We want to test H_{0}: \sigma_{1}^{2} = \sigma_{2}^{2} vs H_{1}: \sigma_{1}^{2} > \sigma_{2}^{2}. We have that the sample standard deviation for n_{2} = 22 female control rats was s_{2} = 28 g and for n_{1} = 18 female low-dose rats was s_{1} = 51 g. So, we have observed the value

F = \frac{s_{1}^{2}}{s_{2}^{2}} = \frac{(51)^{2}}{(28)^{2}} = 3.3176 which comes from a F distribution with n_{1} - 1 = 18 - 1 = 17 degrees of freedom (numerator) and n_{2} - 1 = 22 - 1 = 21 degrees of freedom (denominator).

As we want carry out a test of hypothesis at the significance level of 0.05, we should find the 95th quantile of the F distribution with 17 and 21 degrees of freedom, this value is 2.1389. The rejection region is given by {F > 2.1389}, because the observed value is 3.3176 > 2.1389, we reject the null hypothesis. So, this data suggest that there is more variability in low-dose weight gains than in control weight gains.

You might be interested in
Missing letter<br> H, I,I, K, J,M, _,O,L,W
krok68 [10]

F and U and C and K and then finally U

3 0
2 years ago
Harriet has 3 crates of watermelons. Each crate alone weighs 15.5 pounds and contains between 32 and 36 watermelons. The weight
Anuta_ua [19.1K]

Answer:no

Step-by-step explanation: Each crate is 15.5 pounds there is only 3 crates therefor 3 crates weighing 15.5 pounds each would only weigh 46.5 pounds all together

4 0
3 years ago
Balance the following redox reaction by ion electron method.<br><br>I2+ HNO3 = HI03+ NO2+ H20​
Ad libitum [116K]

Answer:

BRO I DONT KNOW SORY I NEED POINTS

Step-by-step explanation:

7 0
3 years ago
Last summer 37% of a farmer's cherry tree crop was destroyed from a rate tree virus. If the farmer had 2,700 cherry trees at the
posledela
The answer is b I think
4 0
3 years ago
Read 2 more answers
What is the value of 8 to the power of 0
Triss [41]

Answer:

1

Step-by-step explanation:

:)

3 0
3 years ago
Other questions:
  • A achool cafteria makes cheese sauce for mararoni usong 15 cups of swiss cheese and 17 cups of chedder cheese perry tries to mak
    10·1 answer
  • In order to figure out who will go first in a game, your friend asks you to pick a number between 1 and 25. What are the possibl
    9·1 answer
  • What is 2(x+2) squared equals 72?
    9·1 answer
  • A baseball team played 25 games and won 10 of them. What percent of the games did they win?
    8·1 answer
  • PLEASE HELP!!!!!!!!!!!!!!!!!!!!!!
    8·1 answer
  • Presley and Lakira sell cookies. Presley sold 5 less than twice as many cookies as LaKira. If LaKira sold 16 cookies, how many c
    10·1 answer
  • Price of 50 kg rice rupees 7650 find the price of 1 kg rice​
    11·2 answers
  • Please no links just the letter answer and explanation please
    14·1 answer
  • Can someone help me please​
    8·2 answers
  • If g (x) = 3x²-4, then find g (-3)
    15·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!