13. 124] Circle the correct answer. 1) Which of the following indicates the stro

Question

13. 124] Circle the correct answer. 1) Which of the following indicates the strongest linear relationship? 2) A stemplot is most similar to 8) a time plot C) a histogram where the stems are the classes ided to A Math Department can send 10 people to a national convention. The department dec used. 3) select 5 students and 5 faculty members at random. Identify the type of sampling A) Convenience B) Stratified Q) simple Random D) voluntary Response 4) A sample was collected from 98 calls made by local listeners. The sampling technique used was A) Convenience B) Stratified C)Simple Random D) voluntary Response Let X be the number of births until the first boy is born in a large hospital, then X has a binomial distribution. 5) A) true B) false 6) The distribution of adult women's heights is approximately normal with a mean of 64 inches and a standard deviation of 2.7 inches. Heights of 10 year old girls follow an approximately normal distribution with a mean of 54 inches and a standard deviation of 2.5 inches. Alice's height is 65 inches, and her 10 year old daughter's height is 57 inches. Who is relatively higher? A) Alice B) her daughter 7) The sample data appears to come from a normal distributed population with standard deviation 28. Claim: #977. Determine whether the hypothesis test involves a t-test, z-test, neither. A) T-test B) Z-test C) Neither ) A and B are two disjoint events and P( A ) 05, P(B)-0.3, P(A or B) is equal: A) 0.65 B)0.3 C) 0.8 D)0.5

Explanation / Answer

1) A correlation coefficient whose modulus value is closer to 1 shows a stronger linear relationship than the ones with value close to 0. Therefore here the strongest relationship is shown by r = - 0.8

Note that the sign only indicates the direction of the relationship and not the strength.

2) A stem plot basically has a number in its stem and various values are plotted for each of the stem values in the leaf of the diagram, therefore the stems here acts like classes of the histogram and therefore this is like a histogram. C is the correct answer here.

3) Here we first divided the population into two groups called strata - faculty and the students are the 2 groups here. And then a simple random sample of 5 people is drawn from the 2 groups. This is called stratified sampling procedure.

4) Here we are only selecting people from the ones which are calling even though there would be other non caller listeners as well. This is called voluntary sampling because the people here are self selected in the survey.

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