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A production manager wants to find out if there is difference in number of production units manufactured by night shift and the day shift. Random sample of night and day shifts is selected, and number of production units for each shift is recorded. Following statistics resulted:Day shift: sample mean = 27.4, standard deviation = 6.4, sample size = 60. Night shift: sample mean = 18.3, standard deviation = 5.9, sample size = 60. A. Determine a 90% confidence interval on difference in mean number of production units for two shifts.
B. Compute 99% confidence interval for part A.
C. Distinguish the two confidence intervals in parts a and b, and comment on length of intervals.
Student record revealed that 16 out of a random sample of 64 of student with loans. It supposed that current rate is persisting across all students. Compute probability that number of students with loans will be less than 375.
The chamber of commerce of a Florida Gulf Coast community advertises that area residential property is available at a mean cost of $125,000 or less per lot.
Bougainvilleas, mean growth rate was 2.23 inches/week and sample standard deviation was 0.77 inches/week. Determine a 90% confidence interval for mean growth rate of all Bougainvilleas.
The mean salary of the nine employees of a small business is $52,000 per year. One employee, whose salary was $68,000, was red. Two new employees, who will each be paid a salary of $40,000, are hired. What is the new mean annual salary of the emp..
What is the value of c for which there is 80% probability that a metal plate has a thickness with in the interval [4.3-c, 4.3+c]?
Merrill Lynch Securities and Health Care Retirement, Inc., are two large employers in downtown Toledo, Ohio. They are considering jointly offering child care for their employees.
The average number of hours of sleep per night that a college freshman gets is 6.50 with a standard deviation of 1.80 hours. If 35 college freshmen are randomly chosen find the probability that they average at least seven hours of sleep per night.
It is estimated that 2% of the athletes competing in a large tournament are users of an illegal drug to enhance performance. The test for this drug is 95% accurate. What is the probability that an athlete who tests positive is actually a user?
A random sample of 11 health maintenance organizations (HMOs) was selected. For each HMO, the co-payment (in dollars) for a doctor's office visit was recorded. The results are as follows:
Write the linear regression equation to forecast father's education from mother's education?
A certain firm specializing in the manufacture and sale of free time clothing has 80 retail stores in Florida and 140 in California. With each state as a stratum, the firm wishes to estimate average sick-leave time per employee for the past year
You own a $46,000 portfolio comprised of four stocks. The values of stocks A, B, and C are $5,600, $16,700, and $11,400, respectively. What is the portfolio weight of stock D?
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