Question

The Fish and Game Department stocked a lake with fish in the following proportions: 30% catfish,...

The Fish and Game Department stocked a lake with fish in the following proportions: 30% catfish, 15% bass, 40% bluegill, and 15% pike. Five years later it sampled the lake to see if the distribution of fish had changed. It found that the 500 fish in the sample were distributed as follows.

Catfish Bass Bluegill Pike
117 85 222

76

In the 5-year interval, did the distribution of fish change at the 0.05 level?

(A) What is the level of significance?

(B) State the null and alternate hypotheses.

H0: The distributions are the same.
H1: The distributions are the same.

H0: The distributions are different.
H1: The distributions are different.    

H0: The distributions are different.
H1: The distributions are the same.

H0: The distributions are the same.
H1: The distributions are different.

(C) Find the value of the chi-square statistic for the sample. (Round the expected frequencies to at least three decimal places. Round the test statistic to three decimal places.)

(D) Are all the expected frequencies greater than 5? (yes, no)

(E) What sampling distribution will you use? (binomial, Student's t , uniform, chi-square, normal)

(F) What are the degrees of freedom?

(G) Find or estimate the P-value of the sample test statistic. (Round your answer to three decimal places.)

(H) Based on your answers in parts (a) to (c), will you reject or fail to reject the null hypothesis that the population fits the specified distribution of categories?

Since the P-value > α, we fail to reject the null hypothesis.

Since the P-value > α, we reject the null hypothesis.    

Since the P-value ≤ α, we reject the null hypothesis.

Since the P-value ≤ α, we fail to reject the null hypothesis.

(I) Interpret your conclusion in the context of the application.

At the 5% level of significance, the evidence is insufficient to conclude that current fish distribution is different than that of five years ago.

At the 5% level of significance, the evidence is sufficient to conclude that current fish distribution is different than that of five years ago.    

Homework Answers

Answer #1

(A) Level of significance = 0.05

(B) Null and Alternative hypothesis:

H0: The distributions are the same.
H1: The distributions are different.

(C) Value of Chi-square statistic = 11.027

(D) Yes, all the expected frequencies are greater than 5.

(E) Sampling distribution: Chi-square.

(F) Degrees of freedom = 3

(G) P-value = 0.012

(H) Since the P-value ≤ α, we reject the null hypothesis.

(I) At the 5% level of significance, the evidence is sufficient to conclude that current fish distribution is different than that of five years ago.

Calculations:

Know the answer?
Your Answer:

Post as a guest

Your Name:

What's your source?

Earn Coins

Coins can be redeemed for fabulous gifts.

Not the answer you're looking for?
Ask your own homework help question
Similar Questions
The Fish and Game Department stocked a lake with fish in the following proportions: 30% catfish,...
The Fish and Game Department stocked a lake with fish in the following proportions: 30% catfish, 15% bass, 40% bluegill, and 15% pike. Five years later it sampled the lake to see if the distribution of fish had changed. It found that the 500 fish in the sample were distributed as follows. Catfish Bass Bluegill Pike 127 95 205 73 In the 5-year interval, did the distribution of fish change at the 0.05 level? (a) What is the level of...
The Fish and Game Department stocked a lake with fish in the following proportions: 30% catfish,...
The Fish and Game Department stocked a lake with fish in the following proportions: 30% catfish, 15% bass, 40% bluegill, and 15% pike. Five years later it sampled the lake to see if the distribution of fish had changed. It found that the 500 fish in the sample were distributed as follows. Catfish Bass Bluegill Pike 121 92 209 78 In the 5-year interval, did the distribution of fish change at the 0.05 level? (a) What is the level of...
The types of browse favored by deer are shown in the following table. Using binoculars, volunteers...
The types of browse favored by deer are shown in the following table. Using binoculars, volunteers observed the feeding habits of a random sample of 320 deer. Type of Browse Plant Composition in Study Area Observed Number of Deer Feeding on This Plant Sage brush           32% 98                 Rabbit brush           38.7% 133                 Salt brush           12% 40                 Service berry             9.3% 29                 Other             8% 20                 Use a 5% level of significance to test the claim that the natural distribution of browse fits the...
The types of browse favored by deer are shown in the following table. Using binoculars, volunteers...
The types of browse favored by deer are shown in the following table. Using binoculars, volunteers observed the feeding habits of a random sample of 320 deer. Type of Browse Plant Composition in Study Area Observed Number of Deer Feeding on This Plant Sage brush 32% 106 Rabbit brush 38.7% 123 Salt brush 12% 41 Service berry 9.3% 28 Other 8% 22 Use a 5% level of significance to test the claim that the natural distribution of browse fits the...
The types of browse favored by deer are shown in the following table. Using binoculars, volunteers...
The types of browse favored by deer are shown in the following table. Using binoculars, volunteers observed the feeding habits of a random sample of 320 deer. Type of Browse Plant Composition in Study Area Observed Number of Deer Feeding on This Plant Sage brush 32% 108 Rabbit brush 38.7% 116 Salt brush 12% 47 Service berry 9.3% 28 Other 8% 21 Use a 5% level of significance to test the claim that the natural distribution of browse fits the...
The types of browse favored by deer are shown in the following table. Using binoculars, volunteers...
The types of browse favored by deer are shown in the following table. Using binoculars, volunteers observed the feeding habits of a random sample of 320 deer. Type of Browse Plant Composition in Study Area Observed Number of Deer Feeding on This Plant Sage brush           32% 99                 Rabbit brush           38.7% 127                 Salt brush           12% 43                 Service berry             9.3% 28                 Other             8% 23                 Use a 5% level of significance to test the claim that the natural distribution of browse fits the...
A gambler complained about the dice. They seemed to be loaded! The dice were taken off...
A gambler complained about the dice. They seemed to be loaded! The dice were taken off the table and tested one at a time. One die was rolled 300 times and the following frequencies were recorded. Outcome   1   2   3   4   5   6 Observed frequency O   60   44   59   34   46   57 Do these data indicate that the die is unbalanced? Use a 1% level of significance. Hint: If the die is balanced, all outcomes should have the same expected...
The type of household for the U.S. population and for a random sample of 411 households...
The type of household for the U.S. population and for a random sample of 411 households from a community in Montana are shown below. Type of Household Percent of U.S. Households Observed Number of Households in the Community Married with children 26%         96             Married, no children 29%         113             Single parent 9%         32             One person 25%         97             Other (e.g., roommates, siblings) 11%         73             Use a 5% level of significance to test the claim that the distribution of U.S. households fits the...
The type of household for the U.S. population and for a random sample of 411 households...
The type of household for the U.S. population and for a random sample of 411 households from a community in Montana are shown below. Type of Household Percent of U.S. Households Observed Number of Households in the Community Married with children 26%         104             Married, no children 29%         112             Single parent 9%         32             One person 25%         97             Other (e.g., roommates, siblings) 11%         66             Use a 5% level of significance to test the claim that the distribution of U.S. households fits the...
The type of household for the U.S. population and for a random sample of 411 households...
The type of household for the U.S. population and for a random sample of 411 households from a community in Montana are shown below. Type of Household Percent of U.S. Households Observed Number of Households in the Community Married with children 26%         93             Married, no children 29%         127             Single parent 9%         35             One person 25%         88             Other (e.g., roommates, siblings) 11%         68             Use a 5% level of significance to test the claim that the distribution of U.S. households fits the...
ADVERTISEMENT
Need Online Homework Help?

Get Answers For Free
Most questions answered within 1 hours.

Ask a Question
ADVERTISEMENT