23- a. The population 3,9, 14, and 20 has standard deuiation mean of o and the of 4.356. The z-scores por each of Fire data valtes z, the and Zo=1.573. Find 1.01, z4 = -0-944, 2g - -0 157, Z4 =0.629, ond %3D the standard deviation mean of these N-Scores.
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- assume that the data was obtained from two indepen-dent samples. That is, 28 subjects were enrolled into the study, and half were randomly assignedto the corn flakes diet, and half to the oat bran diet. After two weeks the LDL cholesterol level ofeach individual was recorded. LDL (mmol/l)Subject Corn Flakes Oat Bran1 4.61 3.842 6.42 5.573 5.40 5.854 4.54 4.805 3.98 3.686 3.82 2.967 5.01 4.418 4.34 3.729 3.80 3.4910 4.56 3.8411 5.35 5.2612 3.89 3.7313 2.25 1.8414 4.24 4.14 Questions; a) What are the appropriate null and alternative hypotheses for a two-sided test?(b) Conduct the test at the 0.05 level of significance. What is the p-value?(c) Construct a 95% confidence interval.A suburban hotel derives its revenue from its hotel and restaurant operations. Theowners are interested in the relationship between the number of rooms occupied on anightly basis and the revenue per day in the restaurant. Below is a sample of 25 days(Monday through Thursday) from last year showing the restaurant income and numberof rooms occupied.A sample of men and women who had passed their driver's test either the first time or the second time were surveyed, with the following results: Results of the driving testGender First time Second timeMen 126 211Women 135 178a) Do these data suggest that there is a relationship between gender and the passing of their driver’s test from which the present sample was drawn? Let alpha=.05
- Question 6A multinational corporation is conducting a study to see how its employees in five different countries respond to three gifts in an incentivescheme. The numbers of employees who choose each of the three gifts(G1 to G3) in each of the five countries (A to E) are given in the tablein ‘Dataset6’ in the Excel document.1. Set up the structure of an appropriate statistical test to determine whether the data supports a link between choice of gift andcountry, including the statistic to be used.2. Carry out this test, showing clearly in your work how the expectedvalues are calculated for your test statistic. G1 G2 G3 A 5 17 19 B 8 20 19 C 11 16 25 D 12 19 30 E 13 20 28Consider the following hypothetical pooled cross-sectional data of dailyCOVID-19 cases per 1,000 people during the early two months of the pandemic, fromMarch to April 2020 in Ohio and 5 other neighboring states. The variable Apriltakesvalue 1 if the recorded cases are from April 2020, and takes value 0 if the recorded casesare from March 2020. The variable lockdown takes value 1 if the state put in place aStay-at-home order beginning from March 2020, and takes value 0 otherwise. Using thedifference-in-differences estimator, assess the impact of the lockdown policy on dailyCOVID-19 cases.On snow-covered roads, winter tires enable a car to stop in a shorter distance than if summer tires were installed. In terms of the additive model for one-way ANOVA, and for an experiment in which the mean stopping distances on a snow-covered road are measured for each of four brands of winter tires. If the data are as shown in Sheet 48, what conclusion would be reached at the 0.01 level of significance? Shett 48 Supplier A 517 484 463 452 502 447 481 500 485 566 Supplier B 479 499 488 430 482 457 424 488 526 455 Supplier C 435 443 480 465 435 430 465 514 463 510 Supplier D 526 537 443 505 468 533 481 477 490 470 Select one: a) p-value = 0.28 greater than 0.05, the average distance is different for at list two tires b) F stat = 1.86, F crit = 4.38, not enough evidence to claim that the average distance is different for at list two tires c) F ratio = 4.38, not enough evidence to claim that the average distance is different for at list two tires d) F stat = 0.68, F…
- Question #4. US Universities found that 72% of people are concerned about the possibility that their personal records could be stolen over the Internet. If a random sample of 300 college students at a Midwestern university were taken and 228 of them were concerned about the possibility that their personal records could be stolen over the Internet, could you conclude at the 0.025 level of significance that a higher proportion of the university's college students are concerned about Internet theft than the public at large? Report the p-value for this test. Z0.025 = 1.96Table 7 lists the numbers of violent crimes reported to police on randomly selected daysfor this year. The data are taken from three large cities of about the same size.TABLE 7Citi A City B City C5 2 89 4 1212 1 103 13 39 7 97 6 1413At 5% significance level, will you conclude that the numbers of violent reported to police forthree large cities is the sameA researcher was interested in studying if there is a significant relationship between the severityof COVID 19 and blood types of individuals. 2400 individuals were studied and the results areshown below.Condition Blood TypeO A B AB TotalCritical 64 44 20 8 136Severe 175 129 50 15 369Moderate 211 528 151 125 1015Mild 200 400 140 140 880Total 650 1101 361 288 2400a. State both the null and alternative hypotheses. DONEb. Provide the decision rule for making this decision. Use an alpha level of 5%. DONEc. Show all of the work necessary to calculate the appropriate statistic. DONEd. What conclusion are you allowed to draw? DONEe. Would your conclusion change at the 10% level of significance? DONE... I need help with using JASP. pLEASE show me how to input the data f. Confirm test results in part (c) using JASP.