Expected Normal Value 2 0 N Normal Q-Q Plot of Standardized Residual GOO ..... -2 0 Observed Value
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check all four assumptions for given Normal Q-Q and then comments about whether or not each assumption is reasonable met. explain why or why not in each case .
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- Which of the following statements are true? |. In a data-set that is symmetric, the mean is approximately equal to the medi II. In a data-set that is right-skewed, the mean will be less than the median III. Skew of a data set has a negligible effect on the mean, but can strongly affec medianWhich of the following statements is true of Group 2’s mean FIQ score? Group of answer choices: 1. Group 2’s mean FIQ score is higher than Group 1’s mean FIQ score 2. Group 2’s mean FIQ score is lower than Group 1’s mean FIQ score 3. Group 2’s mean FIQ score is higher than the mean FIQ scores for Groups 1 and 3 4. Group 2’s mean FIQ score is lower than the mean FIQ scores for Groups 1 and 3 None of the above Which of the following statements is true of Group 3’s mean FIQ score? Group of answer choices: 1. Group 3’s mean FIQ score is higher than Group 1’s mean FIQ score 2. Group 3’s mean FIQ score is lower than Group 1’s mean FIQ score 3. Group 3’s mean FIQ score is higher than the mean FIQ scores for Groups 1 and 2 4. Group 3’s mean FIQ score is lower than the mean FIQ scores for Groups 1 and 2 None of the abovei need the answer quickly
- You are the product manager for Carl's ice cream. The company president asked you to determine if Carl's ice cream has equal sales as Ole ice cream, which is a strong competitor. The table below contains weekly sales for competing brands for randomly selected 4 approximately equal size stores that did not follow a normal distribution. (Use two digits after deimal point) Carl's Sales Ole Sales 1500 2000 1700 2500 1800 2500 1700 2300 Is there a difference between mean sales at a=5%? a. Ho Hi: Since test statistic = + than critical value = . we * and Therefore mean sales are b. Can it be concluded at 5% significance level that the population median sales for Carl's ice cream exceeds 1600? Ho H: test statistic = Since a=0.05 is * than the p-value = There is * evidence to conclude that median sales for Carl's ice cream is * 1600.What is Ha? (H0 is the mean VIQ scores for the younger, middle-aged, and older subjects are all not different from each other) (Note: 1= 5-25 Years, 2= 26-59 Years, 3= 60-92 Years) Multiple Choices: 1. H0 is not true 2. The mean VIQ scores for the younger, middle-aged, and older subjects 3. are all different 4. The mean VIQ scores for the younger, middle-aged, and older subjects are all different from each other 5. The mean VIQ scores for the younger, middle-aged, and older subjects are not equal to one another 6. The mean VIQ scores for the younger, middle-aged, and older subjects are not the same as each otherWhich of the following describes a Type I error? A. Error associated with decisions to retain the null B. You decide that there is a statistical difference when there is actually no difference C. You decide that there is no difference when there is actually a statistical difference
- Q3. What is a research hypothesis and why is it important to carry-out research? Differentiate between Type I and Type II error and give an example for each.Executives of a supermarket chain are interested in the amount of time that customers spend in the stores during shopping trips. The mean shopping time, μ, spent by customers at the supermarkets has been reported to be 38 minutes, but executives have good reason to believe that u is different from 38 minutes. The executives hire a statistical consultant and ask her to perform a statistical test. To perform her statistical test, the consultant collects a random sample of shopping times at the supermarkets. She computes the mean of these times to be 44 minutes and the standard deviation of the times to be 10 minutes. Based on this information, complete the parts below. (a) what are the null hypothesis Ho and the alternative hypothesis H₁ that should be used for the test? Ho H₁ :0 (b) Suppose that the consultant decides not to reject the null hypothesis. What sort of error might she be making? (Choose one) ▼ (c) Suppose the true mean shopping time spent by customers at the supermarkets is…Researchers studying two populations of wolves conducted a two-sample t-test for the difference in means to investigate whether the mean weight of the wolves in one population was different from the mean weight of the wolves in the other population. All conditions for inference were met, and the test produced a test statistic of t=2.771 and a p-value of 0.01. Which of the following is a correct interpretation of the p-value? Assuming that the mean weights of wolves in the populations are equal, the probability of obtaining a test statistic that is greater than 2.771 or less than −2.771 is 0.01. A Assuming that the mean weights of wolves in the populations are equal, the probability of obtaining a test statistic that is greater than 2.771 is 0.01. B Assuming that the mean weights of wolves in the populations are different, the probability of obtaining a test statistic that is greater than 2.771 or less than −2.771 is 0.01. C Assuming that the mean…
- The histogram of the number of hours of sleep Stat 100 students reported getting each night roughly follows the normal curve with an average of 7.0 hours and a SD of 1.2 hours. a. Approximately 68% of the students sleep between hours and hot (Put the smaller number first) 提交答案|Tries 0/5 b. Approximately 95% of the students sleep between hours and hours. (Put the smaller number first) 提交答案| Tries 0/5 c. If a student sleeps 5.2 hours per night what percent of the people sleep more than her? Do the problem in steps: I. First, find the Z score = 提交答案|Tries 0/3 ii. Now, move the red vertical line on the following graph to the correct Z score by clicking and dragging the mouse. If you are using a touch screen, touch and then slide the region around the vertical line 1.00 Shade the region representing the percent of people who sleep more than her: Shade the region under the normal curve to the O left of the red vertical line O right of the red vertical lineDiscuss the assumptions for one-sampled t-test and why they are important.Each person in random samples of 227 male and 293 female working adults living in a certain town in Canada was asked how long, in minutes, his or her typical daily commute was. Is there enough evidence to show that there is a difference in mean commute times for male and female working residents of this town? (Use males females) Male Female Sample size X S Sample size x S 227 30.2 24.0 293 27.9 24.3 Find the test statistic. (Round your answer to two decimal places.) Find the df. (Round your answer down to the nearest whole number.) df= Use technology to find the P-value. (Round your answer to four decimal places.) P-value= Is there enough evidence to show that there is a difference in mean commute times for male and female working residents of this town? Use a significance level of 0.05. Yes No
