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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?
Suppose you want to conduct a survey of the attitude of psychology graduate students studying clinical psychology toward psychoanalytic methods of psychotherapy.
You randomly select 425 students and ask each one what the top motivation is for using a credit card. Can you conclude that there has been a chagne in the claimed or expected distribution? Use a =0.025.
Were the chi-square and regression tests presented and used correctly? Could the authors' analysis be recreated?
USA today conducted a survey asking readers, "What is the most hilarious thing that has ever happened to you en route to or during a business trip? What kind of sampling method is this?
What is the coefficient of x^5 in the polynomial -8x^5+0x^3+14? Find the slope of the line that contains points (-4,-2) and (1,1)
At the 5% significance level, can the station conclude that the mean age of its listeners is not 25 yrs. Formulate and test the appropriate hypotheses. Use the critical value approach.
Draw the histogram for these data using an initial class boundary of , an ending class boundary of , and classes of equal width.
State the decision rule. Compute the value of the test statistic. What is your decision regarding the null hypothesis?
A national survey is conducted to assess the association between hypertension and stroke in persons over 55 years of age. Compute the incidence of stroke in persons over 55 years of age
Compute the value of the test statistic (to 2 decimals).
A fair die is rolled two times. Let A be the event that the outcome of the first roll is an odd number. Let B be the event that the outcome of second roll is at least 5.
Approximately 65% of all marketing personnel are extroverts, whereas about 50% of all computer programmers are introverts.
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