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Chapter 2: Q 40. (page 109)

Lefties (1.1) Students were asked, 鈥淎re you righthanded, left-handed, or ambidextrous?鈥� The responses are shown below (R = right-handed;

L = left-handed; A = ambidextrous).

(a) Make an appropriate graph to display these data.

(b) Over 10,000 Canadian high school students took the Census At School survey in 2007鈥�2008. What percent of this population would you estimate is lefthanded? Justify your answer.

Short Answer

Expert verified

Part (b) The percentage of the population that is left-handed is 6%

Part (a)

Step by step solution

01

Part (a) Step 1. Given

02

Part (a) Step 2. Explanation

The frequency table for the above data is


Therefore, bar chart is drawn

03

Part (b) Step 1. Explanation

Since, 3of 50were left-handed, 350=0.06=6%

Therefore, the percentage of the population that is left-handed is 6%

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Most popular questions from this chapter

The proportion of observations from a standard Normal distribution with values less than 1.15 is

(a) 0.1251.

(b) 0.8531.

(c) 0.8749.

(d) 0.8944.

(e) none of these.

George has an average bowling score of 180 and bowls in a league where the average for all bowlers is 150 and the standard deviation is 20 Bill has an average bowling score of 190 and bowls in a league where the average is 160 and the standard deviation is 15 Who ranks higher in his own league, George or Bill?

(a) Bill, because his 190 is higher than George鈥檚 180

(b) Bill, because his standardized score is higher than George鈥檚.

(c) Bill and George have the same rank in their leagues because both are 30 pins above the mean.

(d) George, because his standardized score is higher than Bill鈥檚.

(e) George, because the standard deviation of bowling scores is higher in his league.

SAT versus ACT Eleanor scores 680 on the SAT Mathematics test. The distribution of SAT scores is

symmetric and single-peaked, with mean 500and standard deviation 100. Gerald takes the American College Testing (ACT) Mathematics test and scores 27. ACT scores also follow a symmetric, singlepeaked distribution鈥攂ut with mean 18 and standard deviation 6. Find the standardized scores for both students. Assuming that both tests measure the same kind of ability, who has the higher score?

T2.6. The figure shown is the density curve of a distribution. Five of the seven points marked on the density curve make up the five-number summary for this distribution. Which two points are not part of the five-number summary?

(a) Band E
(b) C and F
(c) C and E
(d) B and F
(e) A and G.

If Mrs. Navard had the entire class stand on a 6-inch-high platform and then had the students measure the distance from the top of their heads to the ground, how would the shape, center, and spread of this distribution compare with the original height distribution?

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