In Exercises 5–20, assume that the two samples are independent simple random samples selected from
18. Car and Taxi Ages When the author visited Dublin. Ireland (home of Guinness Brewery employee William Gosset, who first developed the t distribution), he recorded the ages of randomly selected passenger cars and randomly selected taxis. The ages can be found from the license plates. (There is no end to the fun of traveling with the author.) The ages (in years) are listed below. We might expect that taxis would be newer, so test the claim that the
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- In Exercises 13–20, determine whether the data are from a discrete or continuous data set. CHIS Among the subjects surveyed as part of the California Health Interview Survey (CHIS), several subjects are randomly selected and their heights are recorded.arrow_forwardA relationship expert wants to know if people with higher levels of emotionalintelligence (measured on an interval scale from 1–6, with higher numbers meaning more intelligence) will be better liked upon first meeting people (measured on a 1–5 interval scale, with higher numbers meaning more likable). X: Emotional Intelligence Score Y: First Impression Rating 6 4.5 2.5 3.2 3 3 1 2 M=3.13s=2.10SS = 13.19 M=3.18s=1.03SS = 3.17 c) Report results in APA style.d) What do the results mean?arrow_forwardA relationship expert wants to know if people with higher levels of emotionalintelligence (measured on an interval scale from 1–6, with higher numbers meaning more intelligence) will be better liked upon first meeting people (measured on a 1–5 interval scale, with higher numbers meaning more likable). X: Emotional Intelligence Score Y: First Impression Rating 6 4.5 3 3.2 2.5 3 1 2 M=3.13s=2.10SS = 13.19 M=3.18s=1.03SS = 3.17 a) Create a scatterplot of the data.b) Calculate r and r2 .c) Report results in APA style.d) What do the results mean?arrow_forward
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- In Exercises 5–12, identify whether the given value is a statistic or a parameter. Birth Weight In a study of 400 babies born at four different hospitals in New York State, it was found that the average (mean) weight at birth was 3152.0 grams.arrow_forwardA. Find: Solve each number by substituting the value form the given table below. 1 X P(x) 0 1/5 1 2/5 3 1/5 1/5 1. P(3) 2. P(1) + P(4) 3. P(2) x P (3) 4. P(4) + P(2) 5. P(2) + P(3) B. Determine the Mean, Variance and Standard Deviation of each random variable. 1. y 0 1 2 3 4 P(y) 1/5 1/5 1/5 1/5 1/5 5. 2. 3. 4. Y P(y) Z P(z) S P(s) r P(r) 3 0.6 3 0.1 1 1/2 5 0.1 10 3/7 4 0.5 2 1/6 7 0.2 12 0.2 20 4/7 3 1/3 9 0.1 20 0.2arrow_forwardFind the z score for test scores of 70 _____ and 90 ______.arrow_forward
- A manufacturer knows that their items lifespans are normally distributed according to N(5.1,1.5)N(5.1,1.5).What proportion of the items' lifespans will be longer than 6 years?arrow_forwardIf z, and x be 2 values of a variable x and each of the remaining (n – 2) values be +%), find the mean and standard deviation of the n values.arrow_forwardSuppose that 95% of the bags of certain fertilizer mix weigh between 49 and 53 pounds. Averages of three succesive bags were plotted, and 47.5% of these were observed to lie between 51 and X pounds. Estimate the value of X. State assumptions you make and say whether these assumptions are likely to be true for this example.arrow_forward
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