Was there any outliers in it or none
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Was there any outliers in it or none
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- A political analyst believes that a senator's recent decision to support a bill resulted in a drop of approval ratings. To test this claim, he selects random cities in the state that voted the senator in and compares the approval ratings before the decision to the approval ratings after the decision. Suppose that data were collected for a random sample of 8 cities, where each difference is calculated by subtracting the percent approval rating before the decision from the percent approval rating after the decision. Assume that the percentages are normally distributed. What type of test is this hypothesis test? Select the correct answer below: This is a left-tailed test because the alternative hypothesis is H. : Ha 0. This is a two-tailed test because the alternative hypothesis is H, : µa # 0. This is a right-tailed test because the alternative hypothesis is H, : Ha > 0. This is a right-tailed test because the alternative hypothesis is H, : µa < 0.The results of a recent poll on the preference of shoppers regarding two products are shown below. The standard error of is Product Shoppers Surveyed Shoppers FavoringThis Product A 800 560 B 900 612 .025. .68. .0225. .044.3. Suppose you have two datasets, A and B: 5% of the values in dataset A are outliers, while in dataset B 10% are. In which case would eliminating rows with outliers have a greater impact on the quality of your data analysis? Why?
- A watch manufacturer claims that their watches on average will neither gain nor lose time during a week. A sample of 18 watches provided the following gain (+) or losses (-) in seconds per week. -0.61 -0.37 -0.38 -0.32 +0.32 -0.23 -0.20 -0.68 -0.10 -0.20 -0.38 -0.48 -0.47 -0.64 -0.04 +0.30 +0.25 +0.05 (a) What is the point estimate for the true average gain or losses in seconds per week of the watches produced by the manufacturer? (b) Find the 98% confidence interval for the mean gain or loss in time for the watches. (c) Test, at the 0.02 level of significance, whether the mean gain or loss in time for the watches is 0. Is the manufacturer's claim correct? (d) Compute the p-value for the test in (c). (e) State the assumption for the test in (c). (f) Are the results of (b) and (c) consistent?3. Below are the numbers of flights on time and delayed for Alaska Airlines at five airports in one month. On time 497 221 212 503 Seattle 1841 (a)Among the flights to Los Angeles, what percent of flights were delayed? (b)What percent of delayed flights were not flying to Los Angeles? Los Angeles Phoenix San Diego San Francisco Delayed 62 12 20 102 305The television show Degenerate Housewives has been successful for many years. That show recently had ashare of 24, meaning that among the TV sets in use, 24% were tuned to Degenerate Housewives. Assumethat an advertiser wants to verify that 24% share value by conducting its own survey, and a pilot surveybegins with 14 households have TV sets in use at the time of a Degenerate Housewives broadcast.(a) Find P(none)(b) Find P(at least one)(c) Find P(at most one)
- If P(high) = 0.36, P(low) = 0.64, P(favorable | high) = 0.94, and P(unfavorable | low) = 0.63, then what is P(favorable)? 0.0600 0.3384 0.3600 0.5752A watch manufacturer claims that their watches on average will neither gain nor lose time during a week. A sample of 18 watches provided the following gain (+) or losses (-) in seconds per week. -0.61 -0.37 -0.38 -0.32 +0.32 -0.23 -0.20 -0.68 -0.10 -0.20 -0.38 -0.48 -0.47 -0.64 -0.04 +0.30 +0.25 +0.05 (a) What is the point estimate for the true average gain or losses in seconds per week of the watches produced by the manufacturer? (b) Find the 98% confidence interval for the mean gain or loss in time for the watches. (c) Test, at the 0.02 level of significance, whether the mean gain or loss in time for the watches is 0. Is the manufacturer’s claim correct? (d) Compute the p-value for the test in (c). (e) State the assumption for the test in (c). (f) Are the results of (b) and (c) consistent?) A recent poll surveyed 1587 adults (18 years of age and older, residing in the contiguous United States, contacted by phone from randomly selected homes). Residents who agreed to participate were categorized according to their political party preference (Democrat, Republican or other) and their gender (male or female). To make life easier, we’ll focus on the responses from the south (37% of the sample or 588 people). Our question is about the “Gender Gap” in American politics (the gender gap is described as differences in voting preferences for men and women). Is voting preference independent of gender? What test should you use and why?
- In a recent study, 50 males used a new weight-loss supplement, and all but 15 of them experienced weight loss after two weeks. In the same study, 100 females used the same supplement, and all but 22 of them experienced weight loss after two weeks. Fill in the blanks below to make the most reasonable statement possible. The new weight-loss supplement was less effective on ▼(Choose one) in the study. That is because only % of them lost weight after two weeks, whereas % of the ▼(Choose one) lost weight after two weeks.Cigarette packets used to contain cards representing such things as flowers, film stars or football teams. A complete set would comprise n different cards, say, and collectors would aim to obtain a complete set. Clearly, the first packet bought would contain a new card which would start the collection. The next card obtained might simply duplicate the first card, or it might also be a new card, and add to the collection, and so on. Obtain expressions for the mean and variance of the number of packets which must be purchased until a complete set of cards is obtained.If the 5-number summary is 3, 7, 10, 11, 15, the IQR is 11-7=4. 1.5IQR = 1.5*4 = 6 Lower fence = Q1-1.5IQR = 7-6 = 1, so values less than 1 and values greater than the upper fence are considered as outliers. What is the upper fence? Upper fence = Q3+1.5IQR = ?
