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A bank conducts a survey in which it randomly samples 400 of its customers. The survey asks the customers which way they use the bank the most; (1) interacting witha a teller at the bank, (2) using ATMs, or (3) using the bank's Internet banking service. It also asks their level of satisfaction with the service they most often use (on a scale of 0 to 10 with 0 = very poor and 10 = excellent). Does mean satisfaction differ according to how they most use the bank? a. Indentifying notation, state the null and alternative hypotheses for conductiing an ANOVA with data from the survey. b. Report the df values for this ANOVA. About what range of F test statistic values give a P-value below 0.05? c. For the data, F=0.46 and the P-value equals 0.63. What can you conclude? d. What were the assumptions on which ANOVA was based? Which assumption is the most important?
The number of students that enroll in a psychology course is a poisson random variable with mean 100.the course incharge has decided that if the enrolling is 120 or more he will teach the course in two separate sections.
What percentage of employees at the Bureau process fewer forms than Michael? What percentage of employees at the Bureau process more forms than Michael?
The National Survey of Student Engagement (NSSE) surveys freshmen and seniors about their level of engagement in campus and classroom activities that enhance learning.
Use a 0.05 level of significance (? =.05) to determine whether or not the percentage of Atlanta CEOs who have advanced degrees is significantly less than the national percentage.
Ninety of the sample students are in the Business College, 120 are in the Liberal Arts College, and 90 are in the Education College.
How many circuits should the company provide to ensure that an attempted call is blocked (because all circuits are busy) with probability less than 0.01?
Determine Probability values based on discrete distribution.You roll a fair die three times.
If a random sample of 40 voters is chosen, approx. the probability that more than 20 favor this candidate. Use the normal approximation to the binomial with a correction for continuity.
A random sample of 100 oranges is gathered and the mean diameter obtained was 5.12. If another sample of 100 is taken, what is the possibility that its sample mean will be greater than 5.12 inches.
For this same sample of n = 45, find out the width of confidence interval around population mean? Illustrate all work.
What is the purpose of sampling? What are some concerns and dangers of sampling? How important is the sample design to data validity? Explain.
Using the original data, test at the 5% significance level that the population standard deviation of studying times is greater than 4 hours.
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