The percent frequency distributions of job satisfaction scores for a sample of information systems (IS) senior executives and middle managers are as follows. The scores range from a low of 1 (very dissatisfied) to a high of 5 (very satisfied). Job Satisfaction Score IS Senior Executives (%) IS Middle Managers (%) 1 6 3 2 9 10 3 4 12 4 42 45 5 39 30 (a) Develop a probability distribution for the job satisfaction score of a senior executive. x f(x) 1   2   3   4   5   (b) Develop a probability distribution for the job satisfaction score of a middle manager. x f(x) 1   2   3   4   5   (c) What is the probability a senior executive will report a job satisfaction score of 4 or 5?   (d) What is the probability a middle manager is very satisfied?   (e) Compare the overall job satisfaction of senior executives and middle managers. Senior executives appear to be  ---Select--- more less satisfied than middle managers because  % of senior executives have a score of 4 or 5 with  % reporting a 5. We see that  % of middle managers report being very satisfied.

Oxygen demand is a term biologists use to describe the oxygen needed by fish and other aquatic organisms for survival. The Environmental Protection Agency conducted a study of a wetland area. In this wetland environment, the mean oxygen demand was u = 9.3 mg/L with 95% of the data ranging from 6.7 mg/L to 11.9 mg/L. Let x be a random variable that represents oxygen demand in this wetland environment. Assume x has a probability distribution that is approximately normal. In USE SALT (a) Use the 95% data range to estimate the standard deviation for oxygen demand. (b) An oxygen demand below 8 indicates that some organisms in the wetland environment may be dying. What is the probability that the oxygen demand will fall below mg/L? (Round your answer to four decimal places.) (c) A high oxygen demand can also indicate trouble. An oxygen demand above 12 may indicate an overabundance of organisms that endanger some types of plant life. What is the probability that the oxygen demand will exceed…

B. Juries A social psychologist suspects that people who serve on juries tend to be much older than people in the general population. The psychologist obtains voter registration records and finds that 20% of registered voters are between the ages of 18 to 29 years, 45% are between 30 to 49 years, and 35% are age 50 or older. Next the psychologist monitors jury composition over several weeks and observes the following distribution of ages for actual jury members. Jurors' Ages Frequency 18 to 29 years 30 to 49 years 50 and older 12 36 32 What analysis should you conduct to determine if the composition of juries reflects the age distribution among registered voters? State the hypotheses Critical value and df Test statistic

3. A survey was conducted two years ago asking college students their top motivations for using a credit card. To determine whether this distribution has changed, you randomly select 425 college students and ask each one what the top motivation is for using a credit card. Can you conclude that there has been a change in the claimed or expected distribution? Use a = 0.10. Complete parts (a) through (d). Response Old Survey % 27% New Survey Frequency, f Rewards Low rates Cash back Discounts Other 110 24% 98 21% 107 7% 46 21% 64 a. State H, and H, and identify the claim. What is the null hypothesis, Ho? O A. The distribution of motivations differs from the expected distribution. O B. The distribution of motivations is 27% rewards, 24% low rate, 21% cash back, 7% discounts, and 21% other. O C. The distribution of motivations is 110 rewards, 98 low rate, 107 cash back, 46discounts, and 64 other. What is the alternate hypothesis, H,? O A. The distribution of motivations differs from the…