in order to ensure that there is not a large disparity in the quality of education at various schools in a school district, the school board wants to make sure that the variance of the mean standardized test scores for all students at each school in the district is less than 9. To test this claim, they looked at the mean student scores for the standardized test from a random sample of 12 schools in the district. The results from the survey found that the overall mean was a score of 200.280 with a standard deviation of 2.250. with a 0.01, perform a hypothesis test to determine if the variance is less than 9. Assume that the district standardiazed test scores are normally distributed Step 1 of 3: State the null and alternative hypotheses for the test. Fill in the blank below Ha ta=9 order to ensure that there is not a large disparity in the quality of education at various schools in a school district, the school board wants to make sure that the variance of the mean standardized-test scores for all students at each school in the district is less than 9 To test this claim, they looked at the mean student scores for the standardzed test from a random sample of 12 schools in tthe district The results from the survey found that the overall mean was a score of 200 280 with a standard deviation of 2.250. witha 0.01. perform a hypothesis test to determine if the variance is less than 9. Assume that the district standardized test scores are normaly distributed. Step 2 of Compute the value the test statistic Round your answer to three decimal places In order to ensure that there is not a large disparity in the quality of education at various schools in a school district, the school board wants to make sure that the variance of the mean standardized test scores for all students at each school in the district is less than 9. To test this claim, they looked at the mean student scores for the standardized test from a random sample of 12 schools in the district. The resuts from the survey found that the overall mean was a score of 200.280 with a standard deviation of 2.250. with a 0.01. perform a hypothesis test to determine if the variance is less than 9. Assume that the district standardized-test scores are normally distributed. Step 3 of 3: Draw a conclusion and interpret the decision Answer Tables Keypad Keyboard Shortcuts We reject the null hypothesis and conclude that there is insufficient evidence at a 0.01 level of significance that the variance of the mean standardized-test scores for all students at each school in the district is less than 9. We fail to reject the null hypothesis and conclude that there is insufficient evidence at a 0.01 level of significance that the variance of the mean standardized test scores for all students at each school in the district is less than 9. We reject the null hypothesis and concude that there is sufficient evidence at a 0.01 level of significance that the variance of the mean standardized-test scores for all students at each school in the district is less than 9 We fall to reject the null hypothesis and conclude that there is sufficient evidence at a 0.01 level of significance that the variance of the mean standardized-test scores for all students at each school in the district is less than 9

An adventure company runs two obstacle courses, Fundash and Coolsprint. The designer of the courses suspects that the mean completion time of Fundash is not equal to the mean completion time of Coolsprint. To test this, she selects 250 Fundash runners and 285 Coolsprint runners. (Consider these as random samples of the Fundash and Coolspring runners.) The 250 Fundash runners complete the course with a mean time of 76.7 minutes and a standard deviation of 5.7 minutes. The 285 Coolsprint runners complete the course with a mean time of 77.5 minutes and a standard deviation of 5.6 minutes. Assume that the population standard deviations of the completion times can be estimated to be the sample standard deviations, since the samples that are used to compute them are quite large. At the 0.05 level of significance, is there enough evidence to support the claim that the mean completion time, u, of Fundash is not equal to the mean completion time, µa, of Coolsprint? Perform a two-tailed test.…

A consumer research group purchased identical items in eight drugstores. The mean cost for the purchased items was $113.49. The mode was $112. Using the empirical relationship among mean, median, and mode, estimate the median and comment on the skewness of the distribution.

The accompanying dala gives the results of a survey on the number of hours spent online per week on a certain social networking website. Determine if the mean number of hours spent online per week is the same for males as it is for females. Assume that the population variances are unequal Click the icon to view the social media survey data. Is there sufficient evidence at the 0.05 level of significance that the mean number of hours spent online per week is the same for males as it is for females? Determine the null hypothesis, Ho, and the alternative hypothesis, H₁. Let females be population 1 and males be population 2. Survey data Ho H₁ (Type integers or decimals. Do not round.) Gender Female Hours online/week Gender Hours online/week D 4 Male Female 11 Male Female 9 Male Female 8 Male Female 7 Male Female 13 Male Female 2 Male Female 6 Male Female 2 Male Female 6 Male Female 7 Make Female 3 Male Female Female Female Female Female Female Female Female 46021337 Mole 0653T50478145 8…