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If we have an average score of 550 with standad deviation of 100, wih 80 people with an average score of 532what will be the conclusion with a .05 level of significance being used. what is the H0 versus the H1 what is the comparison distribution what are the standard normal cut off values for a test with significance level of 0.05 what is the observed z score? how can i test my hypotheses and get to a conclusion what is the 95% confidence interval for the mean scores

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

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. 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. 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               […]