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Research at the University of Toledo indicates that 50 percent of students change their major area of study after their first year in a program. A random sample of 100 students in the College of Business revealed that 48 had changed their major area of study after their first year of the program. Has there been a significant decrease in the proportion of students who change their major after the first year in this program? Test at the .05 level of significance.
At a local supermarket receiving dock, the number of truck arrivals per day is recorded for 100 days. Estimate the mean from the sample.
Assume that customers enter a store at the rate of 60 persons per hour. a) what is the probability that during 5 minutes interval no one will enter the store?
In a random sample of 120 households, what is the probability that greater than 20 households, but, less than 35 households receive a retirement income?
Supposing that both tests measure the same kind of ability, who has the higher score? If grading were done on a curve, what would their respective percentages be?
In which category is ANOVA properly classified?
Proportion of out-of-tolerance items is greater than 0.02, the robot will be overhauled. Otherwise it will be allowed to continue operating. What is the probability that a satisfactory robot will be overhauled unnecessarily?
What is the purpose of statistical estimation? What statistics do you find most useful in regression analysis? Why?
Calculate the P-value for the test of the hypothesis p1 - p2=0. Let p1 represent the population proportion of eligible students in Pennsylvania.
Normal approximation to the Binomial distribution - Evaluate the probability that at least 195 of the students are female.
What measurements assesses the amount of variance of change in the dependent variable reflected by changes in the independent variable?
If you must estimate the population mean within 2 days, how many outside salespeople should you sample? Use the 90 percent confidence level.
Which of the following methods could be used to determine future order quantities? forecasting, regression, inventory models.
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