please help with the questions below. there are five practice questions i need help with

Course Hero X eCampus: Home X Gradebook Connect X + X -CA A https://ezto.mheducation.com/ext/map/index.html?_con=con&external_browser=0&launchUrl=https 70% . .. V E Wk 4 - Practice: Wk 4 Exercises [due Day 5] @ Saved Help Save & Exit Submit Check my work mode : This shows what is correct or Incorrect for the work you have completed so far. It does not indicate completion. Return to question 2 that follow to determine whether the average spending In the northern region is significantly less than the average spending In the southern region at the 1 percent level. Medicare Spending per Patient (adjusted for age, sex, and race) Statistic Northern Region Southern Region 2 Sample mean $ 3, 123 $ 8, 456 points Sample standard deviation $ 1, 546 $ 3, 678 Sample size 14 patients 16 patients (a-1) Choose the appropriate hypotheses. Assume y Is the average spending In the northern region and us Is the average spending in the southern region. a. Ho UN - Us SO versus H1: UN - 18 20 b. Ho: Pu - us 2 0 versus H1: UN - Us I'm Cortana. Ask me anything. W ? 9:15 AM 9/19/2020Course Hero X eCampus: Home X Gradebook Connect X + X A https://ezto.mheducation.com/ext/map/index.html?_con=con&external_browser=0&launchUrl=https 70% . .. V E Wk 4 - Practice: Wk 4 Exercises [due Day 5] @ Sover Help Save & Exit Submit Check my work 3 The number of entrees purchased In a single order at a Noodles & Company restaurant has had a historical average of 2.05 entrees per order. On a particular Saturday afternoon, a random sample of 50 Noodles orders had a mean number of entrees equal to 2.4 with a standard deviation equal to 0.82. At the 5 percent level of significance, does this sample show that the average number of entrees 2 per order was greater than expected? points (a) Choose the correct null and alternative hypotheses. eBook a. Ho: W > 2.05 vs. H1: / 2.05 c. Ho: W = 205 vs. H1: W = 2.05 Hint O a References Ob OC (b-1) Calculate the t statistic. (Round your answer to 2 decimal places.) teale (b-2) Find the p-value. (Round your answer to 4 decimal places.) p-value (c) Choose the correct conclusion. Because the p-value is greater than 0.05, we conclude that there is no evidence to Indicate a significant Increase In the average number of entrees per order. Because the p-value is less than 0.05. we conclude that there Is evidence to Indicate a significant Increase In the average number of entrees per order. Mc Fraw I'm Cortana. Ask me anything. W (?) 9:15 AM 9/19/2020Course Hero X eCampus: Home X Gradebook Connect X + X A https://ezto.mheducation.com/ext/map/index.html?_con=con&external_browser=0&launchUrl=https 70% . .. V E Wk 4 - Practice: Wk 4 Exercises [due Day 5] @ Sover Help Save & Exit Submit Check my work 4 A special bumper was Installed on selected vehicles in a large fleet. The dollar cost of body repairs was recorded for all vehicles that were Involved In accidents over a 1-year perlod. Those with the special bumper are the test group and the other vehicles are the control group, shown below. Each "repair Incident" is defined as an Invoice (which might Include more than one separate type of 2 damage). points Statistic Test Group Control Group Mean Damage 1 = $ 1, 189 X2 = $ 1, 731 Sample Std. Dev. $1 = $ 702 92 = S Repair Incidents 16 ma = 13 -Book Source: Unpublished study by Thomas W. Lauer and Floyd G. Willoughby. Hint (a) Construct a 95 percent confidence Interval for the true difference of the means assuming equal variances. (Round your final answers to 3 decimal places. Negative values should be Indicated by a minus sign.) References The 95% confidence Interval Is from _ to (b) Repeat part (a). using the assumption of unequal variances with Welch's formula for d.f. (Round the calculation for Welch's of to the nearest integer. Round your final answers to 3 decimal places. Negative values should be indicated by a minus sign.) The 95% confidence Interval Is from to (c) Did the assumption about variances change the conclusion? Yes O No (d) Construct separate 95% confidence Intervals for each mean. (Round your Intermediate terit value to 3 decimal places. Round your final answers to 2 decimal places.) Mean Damage Confidence Interval n = $1,189 1 = $1,731 $ Mc Fraw I'm Cortana. Ask me anything. W (?) 9:15 AM 9/19/2020Course Hero X areCampus: Home X Gradebook Connect X + X A https://ezto.mheducation.com/ext/map/index.html?_con=con&external_browser=0&launchUrl=https 60% . .. V I B 9 C E Wk 4 - Practice: Wk 4 Exercises [due Day 5] 0 Saved Help Save & Exit Submit Check my work 5 A coin was flipped 60 times and came up heads 38 times. At the .10 level of significance. is the coin biased toward heads? (a-1) Ho: mrs.50 versus /1: *> .50. Choose the appropriate decision rule at the .10 level of significance. points 0. Reject H, if z> 1282 b. Reject Ho if z I'm Cortana. Ask me anything. W ? 9:15 AM 9/19/2020Course Hero X areCampus: Home X Gradebook Connect X + X -CA A https://ezto.mheducation.com/ext/map/index.html?_con=con&external_browser=0&launchUrl=https 60% . .. V I B 9 C E Wk 4 - Practice: Wk 4 Exercises [due Day 5] 0 Saved Help Save & Exit Submit Check my work 6 Faced with rising fox costs, a firm issued a guideline that transmissions of 9 pages or more should be sent by 2-day mail instead. Exceptions are allowed, but they want the average to be 9 or below. The firm examined 27 randomly chosen fox transmissions during the next year, yielding a sample mean of 10.32 with a standard deviation of 2.99 pages. points (a-1) Find the test statistic. (Round your answer to 4 decimal places.) The test statistic (a-2) At the .01 level of significance. is the true mean greater than 9? Yes No (b) Use Excel to find the right-toil p-value. (Round your answer to 4 decimal places.) p-value I'm Cortana. Ask me anything. W ? 9:18 AM 9/19/2020