One hundred teachers attended a seminar on mathematical problem solving. The attitudes of representative sample of 12 of the teachers were measured before and after the seminar. A positive number for change in attitude indicates that a teacher’s attitude toward math became more positive. The twelve change scores are as follows. 4; 8; −1; 2; 0; 5; −3; 1; −1; 6; 5; −2 Part (a) What is the mean change score? (Round your answer to two decimal places.) Part (b) What is the standard deviation for this sample? (Round your answer to two decimal places.) 3.54
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the average salary for graduates entering the actuarial field is $40,000. if the salaries are normally distributed with a standard deviation of $5000…
the average salary for graduates entering the actuarial field is $40,000. if the salaries are normally distributed with a standard deviation of $5000 find the probabilty that a. an individual graduate will have a salary over $45,000 b. a group of nine graduates will have a group average over $45,000
One of the authors received a credit card bill for 3,036, but included a charge of 1,909 that was not valid.
One of the authors received a credit card bill for 3,036, but included a charge of 1,909 that was not valid. Find the values of the absolute and relative errors the absolute value is 1,909 what is the relative value?
The National Football League (NFL) records a variety of performance data for individuals and teams.
The National Football League (NFL) records a variety of performance data for individuals and teams. To investigate the importance of passing on the percentage of games won by a team, the following data show the average number of passing yards per attempt (yds/att) and the percentage of games won (WinPct) for a random sample of 10 NFL teams for the 2011 season (NFL website, February 12, 2012). Team YDS/ATT […]
Thirty-five percent of US adults have little confidence in their cars. You randomly select ten US adults.
Thirty-five percent of US adults have little confidence in their cars. You randomly select ten US adults. Find the probability that the number of US adults who have little confidence in their cars is (1) exactly six and then find the probability that it is (2) more than 7. (1) 0.069 (2) 0.974 (1) 0.069 (2) 0.005 (1) 0.021 (2) 0.005 (1) 0.021 (2) 0.026 Say a business wants to know if each salesperson is equally likely to make a sale. The company chooses 5 salespeople and gathers information on their sales experiences. What assumption must be made for this […]