Question

Complete a full hypothesis test for the variance or standard deviation using a chi-square test. Include...

Complete a full hypothesis test for the variance or standard deviation using a chi-square test. Include the hypothesis, critical values, test values, and graph, your decision to accept or reject, and a summary of the information.

A researcher claims that the variance of the number of annual deaths from tornados is more than 1225. 11 years are randomly selected and have a variance of 1444. Is the researcher's claim believable at a = 0.05 level?

Math   Statistics-And-Probability   
0 0
Add a commentTranscribed image text
Next >

Homework Answers

Answer #1

Given : Sample size=n=11

Sample variance = s2 = 1444

Hypothesized value = = 1225

Significance level=

1) Hypothesis : Vs

2) Critical value : ; From excel "=CHIINV(0.05,10)"

Rejection region :

3) The test statistic is ,

Decision : Here , the value of the test statistic does not lies in the rejection region.

Therefore , fail to reject the null hypothesis.

Conclusion : Hence , there is not sufficient evidence to support the claims that the variance of the number of annual deaths from tornados is more than 1225.

0 0
Know the answer?
Your Answer:

Post as a guest

Your Name:

What's your source?

Earn Coins

Coins can be redeemed for fabulous gifts.

Log In

Sign Up

Not the answer you're looking for?
Ask your own homework help question
Similar Questions
You will perform a Chi-Square test and an ANOVA test. For each hypothesis test make sure...
You will perform a Chi-Square test and an ANOVA test. For each hypothesis test make sure to report the following steps: Identify the null hypothesis, Ho, and the alternative hypothesis, Ha. Determine whether the hypothesis test is left-tailed, right-tailed, or two-tailed. Find the critical value(s) and identify the rejection region(s). Find the appropriate standardized test statistic. If convenient, use technology. Decide whether to reject or fail to reject the null hypothesis. Interpret the decision in the context of the original...
PLEASE ANSWER ALL QUESTIONS ! 1. When performing a Chi-Square test, what is the critical value...
PLEASE ANSWER ALL QUESTIONS ! 1. When performing a Chi-Square test, what is the critical value between the accept and reject regions for a test with 5 classes and 25 observations at the 5% level of significance? Select one: a. 11.070 b. 2.87 c. 2.60 d. 9.488 2. True or False: A hypothesis is a statement about a population developed for the purpose of testing. Select one: True False 3. If you ACCEPT the null hypothesis while performing a Chi-Square...
Please include chi square and p value as well as the conclusion of null hypothesis reject...
Please include chi square and p value as well as the conclusion of null hypothesis reject or fail to reject and why? The table below lists the number of games played in a yearly​ best-of-seven baseball championship​ series, along with the expected proportions for the number of games played with teams of equal abilities. Use a 0.05 significance level to test the claim that the actual numbers of games fit the distribution indicated by the expected proportions. Games Played 4...
INCLUDE ALL 5 STEPS FOR EACH HYPOTHESIS TEST. FOR EACH PROBLEM, LABEL EACH STEP CLEARLY AS...
INCLUDE ALL 5 STEPS FOR EACH HYPOTHESIS TEST. FOR EACH PROBLEM, LABEL EACH STEP CLEARLY AS 1-5. 1. NULL AND ALTERNATIVE HYPOTHESES 2. CRITICAL VALUE 3. TEST VALUE 4. DECISION 5. CONCLUSION 1. A stockbroker thought that the average number of shares of stocks traded daily in the stock market was about 500 million. To test the claim, a researcher selected a random sample of 40 days and found the mean number of shares traded each day was 508 million...
The mean age when smokers first start is 13 years old with a population standard deviation...
The mean age when smokers first start is 13 years old with a population standard deviation of 1.8 years. A researcher thinks that smoking age has significantly changed since the invention of ENDS—electronic nicotine delivery systems. A survey of smokers of this generation was done to see if the mean age has changed. The sample of 34 smokers found that their mean starting age was 12.1 years old. Do the data support the claim at the 1% significance level? ho=...
Use the Chi-square test for independence to test the null hypothesis of no association between cigarette...
Use the Chi-square test for independence to test the null hypothesis of no association between cigarette smoking and asthma symptoms. The expected cell counts, have been computed for you. Ever Smoked Cigarettes (OBSERVED) Symptoms of Asthma Yes No Total Yes 20 30 50 No 22 78 100 Total 42 108 150 Ever Smoked Cigarettes (EXPECTED) Symptoms of Asthma Yes No Total Yes 14 36 50 No 28 72 100 Total 42 108 150 4) (10 points) Conduct the test at...
PLEASE Use the runs test for randomness and complete a hypothesis test with all 5 steps...
PLEASE Use the runs test for randomness and complete a hypothesis test with all 5 steps listed in the module summary for this unit to answer each question. AND please show all work so i understand how to do it!!! Exercise 5. Xs and Ys. A researcher listed a sequence of Xs and Ys as shown in the table below. The list is read from left to right and row by row, top to bottom. Another researcher claims that the...
According to a famous nutritionist, the standard deviation for number of milligrams of vitamin C per...
According to a famous nutritionist, the standard deviation for number of milligrams of vitamin C per 100 grams of fruits and vegetables is 12.7 mg. A skeptical researcher believed this number was too low and took a same of 23 fruits and vegetables to test the claim. The sample standard deviation for the amount of vitamin C was 16.5 mg. With alpha = 0.05, test the claim. a) Is this a test that uses, z-scores, t-scores, or chi-squared values? b)Does...
Conduct the hypothesis test and provide the test statistic and the critical​ value, and state the...
Conduct the hypothesis test and provide the test statistic and the critical​ value, and state the conclusion. A person randomly selected 100 checks and recorded the cents portions of those checks. The table below lists those cents portions categorized according to the indicated values. Use a 0.10 significance level to test the claim that the four categories are equally likely. The person expected that many checks for whole dollar amounts would result in a disproportionately high frequency for the first​...
Two Sample Hypothesis Test Show all five steps in your analysis. To get full credit you...
Two Sample Hypothesis Test Show all five steps in your analysis. To get full credit you must label the CV (critical value) and TV (Test Value) in your drawing. Use the p-value for this test. A teacher claims 9 year old girls are taller than 9 year old boys. Test this claim at an alpha level of .05. A researcher randomly selected a sample of 60 boys and another sample of 50 girls. The statistics from these two samples are...
ADVERTISEMENT
Need Online Homework Help?

Get Answers For Free
Most questions answered within 1 hours.

Ask a Question
ADVERTISEMENT