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Q1) Stockbroker at Critical Securities reported that mean rate of return on a sample of 10 oil stocks was 12.6 percent with the standard deviation of 3.9%. Mean rate of return on a sample of 8 utility stocks was 10.9% with standard deviation of 3.5%. At 0.05 significance level, can we conclude that there is more variation in oil stocks?
2) Following hypotheses are given,
H0: s12 ≤ s22
H1: s12 > s22
Random sample of five observations from first population resulted in standard deviation of 12. A random sample of 7 observations from second population illustrated a standard deviation of 7. At 0.01 significance level, is there more variation in first population?
Q3) Research at University of Toledo indicates that 50% of students change their major area of study after their first year in the program. A random sample of 100 students in college of Business disclosed that 48 had changed their major area of study after their first year of program. Has there been a noteworthy decrease in proportion of students who change their major after first year in this program? Test at 0.05 level of significance.
The ages of cars owned by all employees of a large company have a bell shaped distribution with a mean of 8 years and a standard deviation of 2 years. Using the empirical rule, find the approx. percentage of cars (owned by those employees) that are b..
If random sample of thirty six customer transactions points out that sample mean withdrawal amount is $172, is there evidence to think that population mean withdrawal amount is no longer $160? Determine the mean of data above?
Conclude the finite population, correction factor.With the population size of 1,000 and a planned sample size of 200, what is the finite population, correction.
Robinson & Associates performs employment screening for large companies in southern California. It usually follows two-step process. First potential applicants are given a test that covers basic knowledge and intelligence. If applicants score b..
What is the 95% confidence interval for the true mean length of the bolt?
The Greenberg public hearing meeting turned stormy. Citizens from four suburbs were gathered at city hall to try to get the city's federal funds for their own suburbs. The government recently awarded $750,000 to the city for road improvements. The..
What is the probability of obtaining 4 ones in a row when rolling a fair, six-sided die? Interpret this probability.
Which of the following models satisfies the rules of probability and The event corresponding to the above system functioning properly during one period of operation is
Is the hot-air balloon significantly shorter than light rail? How can you tell? What do you tell university officials?
The data below shows the time to process an inpatient admission, before and after a system usage training session was given. The following hypotheses were formulated for this study.
Assume that the amount your town's population grows every year is fixed or constant. Utilize your equation in part b to approximate the population in the year 2030.
Determine the z values for 29 and 34 hours. What percent of the garages take between 32 hours and 34 hours to erect?
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