Does having pets help reduce the rate of hypertension in adults? To attempt to answer thisquestion, researchers asked a sample of 50 adults whether or not they have hypertensionand how many pets they have (with options "none," "only one," or "more than one"). Ofthe 40 people without hypertension, 45% had only one pet. The same number of peoplewith only one pet and more than one pet had hypertension. And of the 8 people with morethan one pet, 75% did not have hypertension.a. Create a contingency table to display this data.b. What proportion the adults with at least one pet had hypertension?c.Are having hypertension and having no pets independent events for this sample?Justify your answer.d. List one possible confounding variable for this analysis and explain what impact itmight have on the variables of interest.

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Answered: how many pets they have (with options…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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Ancestry and Region. The U.S. Census Bureau collects information on the U.S. population by ancestry and region of residence and publishes the results in American Community Survey. According to that document, 18% of the population resides in the Northeast. a. If ancestry and region of residence are not associated, what percentage of Americans of Irish ancestry would reside in the Northeast? b. There are roughly 37 million Americans of Irish ancestry. If ancestry and region of residence are not associated, how many Americans of Irish ancestry would reside in the Northeast? c. There are, in fact, 9.25 million Americans of Irish ancestry who reside in the Northeast. Given this information and your answer to part (b), what can you conclude?
4- A florist is interested in the proportion of her clients that prefer roses in their flower arraignment. She surveys 30 customers. Define the following in terms of the study. Give examples where appropriate. a. Population b. Parameter d. Sample e. Statistic f. Variable g. Data
2) You want to figure out if there is a difference in lengths between male and female kestrels (kestrels are small falcons found all over Northern Virginia). You catch 11 females and 10 males with the following results (in cm): Females: 27.3 28.2 25.1 25.6 25.5 29.1 27.0 25.4 25.8 27.3 26.6Males: 24.1 23.3 24.8 24.8 23.5 23.0 23.8 23.4 21.6 20.3Is there a difference in lengths? Use α = .01. Note that you have to calculate everything yourself.
In order to daw meaningful conclusion regarding the sex and race between of arrestees in New York City, data is gathered on all arrests made over a 1 year period. This is an example of: a. inferential statistics b. descriptive statistics c. data reduction d. discovery e. statistical analysis
3. The number of tie-breaking votes cast by each of the 21 vice presidents of the United States who served during the twentieth century are shown. Draw a histogram for this data: 0, 0, 4, 10, 0, 2, 3, 3, 4, 1, 7, 8, 0, 4, 2, 0, 0, 1, 7, 0, 4 esc FI F2 ㅁㅁ F3 F4 F5 MacBook Air F6 F7 * F8 F9 F10 F11 + 1/ F12
b. TripAdvisor is one of many online websites that provides ratings for hotels throughout the world. TripAdvisor uses a semi-automated telephone process to take reservations from its customers. This company conducts a survey of customers, asking them what problems they have encountered in making reservations. The chart below shows the analysis of the customer responses (BS = Busy Signal; TL = Too Long to Wait; GD = Got Disconnected; WP = Transferred to the Wrong Person). Problems Encountered Making Enquiries by Telephone 450 400 400 350 -300 250 200 175 150 100 50 50 25 0 BS TL GD WP Type of Complaint What percentage of customers encountered "Busy Signal" or "Too Long to Wait" when making reservations? Number of Complaints
Ex. 1 A survey of 80 r/s California State University students indicates that 52 of them work. An independent survey of 40 University of California students indicates that 20 of them work. Construct a 95% c.i. for the difference between the overall percent of CSU students who work and the UC percent.
Consider a box with 5 tickets. three are labeled "0". two are labeled "1". Draw twice from the box with replacement. Make a frequency, distribution table, and a histogram.
1. In one season, the New England Patriots won 14 football games and lost 2 games. Which number sentence should be used to find the percentage (p) of all games played that season that were wins? A. p = 14.2
19. A high school math teacher summarized the 35 math SAT scores for the students in her calculau class. The mean for the class was 521 and themedian was 535. The range of the scores was 235 and the highest score in the entire class was 675. Approximately 40% of the lass scored higher than 562. State whether each of the following is true or false. a. The 45th percentile exceeds 540. b. The lowest score in the class was 440. c. The z-score for a score of 510 is a negative number. d. The third quartile exceeds 562. e. The percentile rank of 562 is 40.
Q13. For the following set of numbers: 8, 12, 20, 6, 11, 12, 11, 12 a) Organise the data into a table. Note: Tables must be produced using a software package or by hand using a ruler.
c) A major baseball league season came to an abrupt end in the middle of sporting season in 1999. In a poll of 600 adults, 174 blamed the players for the strike, 204 blamed the owners and the rest held various other opinions. Estimate the difference between the proportion of adults who blame players for the strike and the proportion of adults who blame the owners and interpret what the difference implies. What percent the adults have varying opinions on the strike.

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