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List the possible samples without replacement of size 5 that can be obtained from the population of five officials?
Every month a clothing store conducts an inventory and calculates losses from theft. The store would like to reduce these losses and is considering two methods.
A representative cross section of several thousand husband-wife pairs is obtained. Looking at the ages, the average age of the husbands is 46 years and the average age of the wives is 43 years, with
Compute the slope and y-intercept of the least squares regression line for predicting the age of a husband from the age of his wife.
Calculate the residual standard deviation for predicting a person's IQ score at age 35 from his/her IQ score at age 18.
Outback Beer bottles have been found to have a standard deriviation of 5 ml If 5 percent of the bottles contain less than 535 ml what is the average filling volume of the bottles?
In a study of the stability of IQ scores, a large group of people was tested at age 18 and the same people were tested again at age 35. At both age 18 and age 35, the average IQ score was around 100
A sample space S consists of five simple events with these probabilities:
The F.S. Supplies Company buys calculators from a Japanese supplier. The probability of a defective calculator is 20%. If 15 calculators are selected at random, what is the probability that 5 or mor
A door-to-door sale person for a Household appliance learned from her past experience that out of twenty demonstrations of her appliance only seven result in actual sales (long run average). This we
A box has ten coins. Six of the coins have a probability of heads 3/10. The other four coins have probability of heads 8/10. A coin is chosen at random and tossed.
Beverly has estimated that, during the 3 years of the lease, there is a 40% chance she will drive an average of 12,000 miles per year, a 30% chance she will drive an average of 15,000 miles per year
A group of medical professionals is considering the construction of a private clinic. If the medical demand is high (i.e., there is a favorable market for the clinic), the physicians could realize a
In six human births, what is the probability that the number in which the gestation period exceeds 9 months is
The demand of a certain book in a bookstore on any given day is given by the above mentioned table. On 5 randomly chosen days, what is the probability that 3 of the 5 days have demand more than 4.
Consider the formula used for any confidence interval and the elements included in that formula. What happens to the confidence interval if you (a) increase the confidence level, (b) increase the sa
Tonya scores 1318 on the SAT. Jermaine scores 27 on the ACT. Assuming that both tests measure the same thing, who has the higher score?
A student is taking a multiple choice exam in which each question has 4 choices. Assuming that she has no knowledge of the correct answers to any of the questions, she has decided on a strategy in w
It is known that 20% of all persons given a certain medication get very drowsy within 2 minutes. Find the probabilities that among 15 persons given the medication, at most 2 will get very drowsy wit
If the probability is 0.60 that a person traveling in a certain airline will pay extra to see a movie, what is the probability that only 3 of 6 persons traveling on this airline will pay an extra to
Oklahoma is ranked 36 out of 51 states and the District of Columbia in the violent crime rate. What is the percentile rank of the state of Oklahoma? What percentange of states has higher crime rates
At an electronics plant, it is known from past experience that the probability is 0.84 that a new worker who has attended the company's training program will meet the production quota, and that the
Find a 95% CI for the slope, β1. Test the hypotheses H0 :β1 = O verses HA: β1 doesn;t equal 0 at α=0.05level. Construct a 95% confidence interval for μY |X=50 (i.e. the confide
Estimate the soil water content at the surface of the soil. Estimate the soil water content at a depth of 50 cm. Estimate the error variance s2.
On the basis of this model, what can you say (in general) about the change in soil water content with increasing depth?