In baseball, is there a linear correlation between batting average and home run percentage? Let x represent the batting average of a professional baseball player, and let yrepresent the player's home run percentage (number of home runs per 100 times at bat). A random sample of n = 7 professional baseball players gave the following information.

a) Use a calculator to verify that Σx = 1.955, Σx2 = 0.552, Σy = 30.1, Σy2 = 151.65 and Σxy = 8.722. Compute r. (Round your answer to three decimal places.)____________

Do larger universities tend to have more property crime? University crime statistics are affected by a variety of factors. The surrounding community, accessibility given to outside visitors, and many other factors influence crime rate. Let x be a variable that represents student enrollment (in thousands) on a university campus, and let y be a variable that represents the number of burglaries in a year on the university campus. A random sample of n = 8 universities in California gave the following information about enrollments and annual burglary incidents.

b) Use a calculator to verify that Σx = 153.0, Σx2 = 3342.50, Σy = 249, Σy2 = 10579 and Σxy = 5580.1. Compute r. (Round to 3 decimal places.)______________

Is the magnitude of an earthquake related to the depth below the surface at which the quake occurs? Let x be the magnitude of an earthquake (on the Richter scale), and let ybe the depth (in kilometers) of the quake below the surface at the epicenter.

(c) Use a calculator to verify that Σx = 23.9, Σx2 = 85.31, Σy = 53.6, Σy2 = 461.36 and Σxy = 190.81. Compute r. (Round to 3 decimal places.)______________

BLAST results will indicate the percentage of genome comparison among known sequences as well as predicted sequences. A predicted sequence can best be characterized as a(n)

All cancers arise as a result of changes in the DNA sequence of the genomes of cancer cells. Gene expression assays may be helpful in showing the progression of the cancer phenotype by identifying the driver mutations which are:

Use (a) the percentage method and (b) the wage-bracket method to compute the federal income taxes to withhold from the wages or salaries of each employee. Enter all amounts as positive numbers. Round your calculations and final answers to the nearest cent.

.

Table of Allowance Values for 2017

the Percentage Method Tables.

the Wage-Bracket Method Tables.

The true percentage of left-handed people is 13% (p = .13)

1) a. If we survey two hundred people, how many left handers do you expect to survey?

b. If you repeat this survey, will you always get this number of left-handers (the
expectation)? Why or why not?

c. What is the spread (standard deviation) of the sample proportions?

d. Use the empirical rule to describe where we expect sample proportions to lie if we
repeated this survey (with size of 200 people) over and over again

68% of sample proportions would lie between ______________and _____________

95% of sample proportions would lie between _____________and______________

99.7% of sample proportions would lie between _____________and______________

The U.S. Census Bureau conducts annual surveys to obtain information on the percentage of the voting-age population that is registered to vote. Suppose that 418 employed persons and 413 unemployed persons are independently and randomly selected, and that 251 of the employed persons and 183 of the unemployed persons have registered to vote. Can we conclude that the percentage of employed workers (p1), who have registered to vote, exceeds the percentage of unemployed workers ( p2 ), who have registered to vote? Use a significance level of α=0.01 for the test.

Step 1 of 6: State the null and alternative hypotheses for the test.

Step 2 of 6: Find the values of the two sample proportions, p^1 and p^2. Round your answers to three decimal places.

Step 3 of 6: Compute the weighted estimate of p, p‾. Round your answer to three decimal places.

Step 4 of 6: Compute the value of the test statistic. Round your answer to two decimal places.

Step 5 of 6: Determine the decision rule for rejecting the null hypothesis H0H0. Round the numerical portion of your answer to two decimal places.

Step 6 of 6: Make the decision for the hypothesis test.

The U.S. Census Bureau conducts annual surveys to obtain information on the percentage of the voting-age population that is registered to vote. Suppose that 642 employed persons and 745 unemployed persons are independently and randomly selected, and that 376 of the employed persons and 300 of the unemployed persons have registered to vote. Can we conclude that the percentage of employed workers ( p1 ), who have registered to vote, exceeds the percentage of unemployed workers ( p2 ), who have registered to vote? Use a significance level of α=0.1 for the test.

Step 1 of 6: State the null and alternative hypotheses for the test.

Step 2 of 6: Find the values of the two sample proportions, p^1 and p^2. Round your answers to three decimal places.

Step 3 of 6: Compute the weighted estimate of p, p‾. Round your answer to three decimal places.

Step 4 of 6: Compute the value of the test statistic. Round your answer to two decimal places.

Step 5 of 6: Determine the decision rule for rejecting the null hypothesis H0. Round the numerical portion of your answer to two decimal places.

Step 6 of 6: Make the decision for the hypothesis test.

How are the density-time measurements in a hydrometer translated into grain size percentage-passing data?

11. A relative frequency value of 0.074 is equal to what percentage?

12. What is incorrect in the grouped frequency classes below?

Class Interval

100 - 105

105 - 110

110 - 115

115 - 120

A. There are no problems

B. The classes are not mutually exclusive

C. The class width is inconsistent

D. The classes are not continuous

12. The possible grades on a statistics class project are A, B, C, D, and F. In one section, the frequency of Cs in the class is 10. Which of the following statements are true?

14. The midpoint for the class 83 - 87 is _____.

15. What is incorrect in the grouped frequency classes below?

Class Interval

27 - 32

33 - 38

40 - 45

46 - 51

52 - 57

16. The class width for the class intervals below is ________.

83 - 87

88 - 92

93 - 97

What percentage of individuals with colon cancer have a familial form of colon cancer? What is the prevalence of inherited mutations in the APC gene?

A recent study of high school students shows the percentage of females and males who have at LEAST one notation in their school record for inappropriate behavior. A simple random sample of high school students was interviewed. The students were asked whether they had a notation for inappropriate behavior in their school record. Of the 100 females, 21 answered yes, as did 145 of the 400 males.

Part A: Construct and interpret a 99% confidence interval for the difference in population proportions of females and males who have at LEAST one notation for inappropriate behavior. Be sure to state the parameter, check conditions, perform calculations, and make conclusion(s). (8 points)

Part B: Does your interval from part A give convincing evidence of a difference between the population proportions? Explain. (2 points) (10 points)