The piston diameter of a certain hand pump is 0.6 inch. The manager determines that the diameters are normally distributed, with a mean of 0.6 inch and a standard deviation of 0.007 inch. After recalibrating the production machine, the manager randomly selects 27 pistons and determines that the standard deviation is 0.0062 inch. Is there significant evidence for the manager to conclude that the standard deviation has decreased at the a=0.01 level of significance?

Conduct a complete hypothesis test: Researchers have often noted increases in nonviolent crime during the warm weather months. Over the past 30 years, a particular precinct has noted an average of ? = 14 nonviolent crimes during the summer months. Assume the distribution is nearly normal with ? = 3. For a sample of n = 4 weeks in which the daily temperature was extremely hot, the weekly average of non-violent crimes was M = 17.25. What is the independent variable? Nonviolent crimes What are the levels of the independent variable? What is the level of measurement of the independent variable? What is the dependent variable? What is the level of measurement of the dependent variable? If you were to graph your results, what type of graph would you make? Explain. Is there a significant difference in the number of non-violent crimes during hot weatherdays compared to typical days? Test at the alpha = .05 level. Compute Cohen’s d. Give a full APA summary of your findings. What is the…

cant find the p value or the test statistic for the following: Only 13% of registered voters voted in the last election. Will voter participation change for the upcoming election? Of the 351 randomly selected registered voters surveyed, 32 of them will vote in the upcoming election. What can be concluded at the αα = 0.01 level of significance?

The test statistic of z=1.32 is obtained when testing the claim that p≠0.793. Identify the hypothesis test as being​ two-tailed, left-tailed, or​ right-tailed. Find the​ P-value. Using a significance level of α=0.10​, should we reject Ho or should we fail to reject Ho​?   This is a test. P-value= (Round to three decimal places as​ needed.) Choose the correct conclusion below.   Reject Ho. There is not sufficient evidence to support the claim that p≠ 0.793. Fail to reject Ho. There is sufficient evidence to support the claim that p≠ 0.793. Reject Ho. There is sufficient evidence to support the claim that p≠ 0.793. Fail to reject Ho. There is not sufficient evidence to support the claim that p≠ 0.793.

a. Test the claim that the contents of cans of diet soda have weights with a mean that is less than the mean for the regular soda.   What are the null and alternative​ hypotheses? The test​ statistic, t, The​ P-value is   State the conclusion for the test.     A. Fail to reject the null hypothesis. There is sufficient evidence to support the claim that the cans of diet soda have mean weights that are lower than the mean weight for the regular soda.   B. Reject the null hypothesis. There is not sufficient evidence to support the claim that the cans of diet soda have mean weights that are lower than the mean weight for the regular soda.   C. Fail to reject the null hypothesis. There is not sufficient evidence to support the claim that the cans of diet soda have mean weights that are lower than the mean weight for the regular soda.   D. Reject the null hypothesis. There is sufficient evidence to support the claim that the cans of diet soda have mean weights that…

A television show conducted an experiment to study what happens when buttered toast is dropped on the floor. When 49 buttered slices of toast were dropped, 28 of them landed with the buttered side up and 21 landed with the buttered side down. Use a 0.01 significance level to test the claim that toast will land with the buttered side down 50% of the time. Use the P-value method. Use the normal distribution as an approximation to the binomial distribution. After that, supposing the intent of the experiment was to assess the claim that toast will land with the buttered side down more than 50% of the time, write a conclusion that addresses the intent of the experiment.

Use a t-test to test the claim about the population mean u at the given level of significance a using the given sample statistics. Assume the population is normally distributed. Claim: u = 52,900; a= 0.01 Sample statistics: x = 53,746, s= 2700, n = 19 Click the icon to view the t-distribution table. What are the null and alternative hypotheses? Choose the correct answer below. O A. Ho u#52,900 Hg: u= 52,900 O B. Ho: us 52,900 Ha: H> 52,900 ОС. Но: и252,900 Hgi H< 52,900 O D. Ho: µ = 52,900 Hg: µ#52,900 %3D What is the value of the standardized test statistic? The standardized test statistic is. (Round to two decimal places as needed.) What is(are) the critical value(s)? The critical value(s) is(are). (Round to three decimal places as needed. Use a comma to separate answers as needed.) Decide whether to reject or fail to reject the null hypothesis. O A. Fail to reject Ho. There is enough evidence to reject the claim. O B. Reject Ho. There is not enough evidence to reject the claim. OC.…

Use the calculator displays to the right to make a decision to reject or fail to reject the null hypothesis at a significance level of α = 0.10. Choose the correct answer below. O A. Since the P-value is less than a, fail to reject the null hypothesis. O B. Since the P-value is greater than x, reject the null hypothesis. O C. Since the P-value is greater than x, fail to reject the null hypothesis. O D. Since the P-value is less than a, reject the null hypothesis. -C Z-Test Z-Test Inpt: Data Statsu #80 Ho:80 0:5.75 x:78.75 n:35 #μο μο Calculate Draw z 1.2861043 p=0.19840666 x = 78.75 n=35

A hypothesis test is performed on the following where the claim is the null hypothesis Ho:p = 0.74 H :p+0.74 a.) What population parameter is being tested? a. proportion b. standard deviation C. mean d. variance b.) What type of hypothesis test is being performed? a. left-tailed b. right-tailed c. two-tailed

A claim is made that the proportion of children who play sports is less than it used to be. Assume that you plan to use a significance level of αα =  0.05  to test the claim that p<0.5p<0.5. Find the critical value for this hypothesis test, then use x=396x=396 and n=1320n=1320 from the sample data to decide if the statistics support the claim. -1.96; yes, they do support the claim -1.96; no, they do not support the claim -1.645; yes, they do support the claim -1.645; no, they do not support the claim