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1. The average cost of XYZ brand running shoes is $85 per pair (, with a standard deviation of $8 (σ = 8). If nine pairs of running shoes are selected (n = 9), find the probability that the mean cost of a pair of shoes will be less than $80: P(. Assume that the variable is normally distributed.
Consider randomly selecting a student at a certain university, and let A denote the event that the selected individual has a Visa credit card and B be the analogous event for a MasterCard. Suppose that P(A) = .5, P(B) = .4, and P(A intersect B..
In samples of mortgages of size 75, what proportion of the samples would you expect to produce sample proportions equal to or larger than 0.25?
Suppose you know that the distribution of sample proportions of nonresidents in samples of 200 students is normal with a mean of 0.04 and a standard deviation of 0.03.
What is the probability that a given (i.e. one) textbook weighs more than 5.5 pounds? Imagine the distribution of all possible samples averages of textbook weights (with n=16). What is the weight that separates the lightest 25% of sample averages f..
If he selects the three brands at random, what is the probability that he will select the following?
An essential part of cost control in any healthcare organization is staffing levels, maintaining the right mix of professional individuals at any given time. Inventory and production control models are designed for static environments. Would such ..
if 30 claims are selected, find the probability that 15 will contain 0 errors, 8 will contain 1 error, 5 will contain two errors and 2 will contain 3 errors.
Consider the joint pdf fX;Y (x; y) = 6y; for 0
During the flu season, all 50 were exposed to the flu and 29 actually contracted the disease. Is there any evidence to suggest the claim is false, that the chance of contracting the flu is greater than 44%?
Show that maximizing expression (Eq. 8.37) yields the normal equations (Eq. 8.38),
A company self-insures its large fleet of cars against collisions. To determine its mean repair cost per collision, it has randomly chosen a sample of 16 accidents. If the average repair cost in these accidents is $2,200 with a sample standard de..
in a particular occupation a random sample of 210 men found that 65 smoked. in a random sample of 240 women 87 smoke.
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