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With a= .05 and a sample of n = 15 participants in a repeated-measures study comparing two treatments, what are the t statistic boundaries for the two-tailed critical region?
On a typical spring afternoon, customers enter a bookstore at a rate of 100 per hour. In a 2 minute period, what is the probability of 1 or less customers entering the store?
What is the expected value and variance of the number of defective chips? What is the probability that they discover exactly 9 defective chips in this test?
Suppose that in fact the proportion of the adult population who say their health is excellent is 0.29. What is the probability that the sample proportion of an SRS of size 1000 who say their health
Scores on performance following a training program are known to be approximately normal with the mean of 14 and variance of 4. find the probability of obtaining the score of exactly 6.
What is the probability that the passenger will catch the bus? [Hint: Let Y1 denote the bus arrival time and Y2 the passenger arrival time; determine the joint density of Y1 and Y2 and find P(Y2 &le
Suppose cell phones are available in two basic types: Flashy or Dull. Furthermore, suppose cell phone owners fall into two basic categories: Hipsters or Grannies. What is the probability that any ran
A sample of 50 companies is selected, and the revenues (in billions of dollars) are shown. At α = 0.05, is there enough evidence to support the researcher's claim? σ = 28.7.
You are considering investing $100 in this asset. After 1 year, the value will be $100(1+R). What is the expected value and standard deviation of the value of your asset in 1 year?
The number of students that enroll in a psychology course is a poisson random variable with mean 100.the course incharge has decided that if the enrolling is 120 or more he will teach the course in
Treating the claims as psus and the observations for each field as ssus, estimate the error rate, defined to be the average number of errors per field, along with the standard error for your estimat
A coin that is balanced should come up heads half the time in the long run. A coin is tossed 4040 times and gives 2085 heads. Is the coin biased? Use Alpha = .05.
A sample of size 9 is drawn at random from a Normal distribution. The experiment has a null hypothesis of μ = 0 and an alternate hypothesis of μ > 0. The mean of the sample is 7 with an s o
With quarter 1 of 20X1 being designated 1 and increasing by 1 each quarter. What is the forecast value for the fourth quarter of 20X5?
A random sample of 20 prices for summer sleeping bags was taken with a sample mean of $83.75 and a sample standard deviation of $29.97.
The owner of the Grapes O'Raff vineyard has collected the following data for the prices (per ton) and quantities (tons) of harvested crops for the years 2007 and 2009.
Historically, 93% of the deliveries of an overnight mail service arrive before 10:30 the following morning. What proportion of the samples will have more than 95% of the deliveries arriving before 10:
Plastic bags used for packaging produce are manufactured so that the breaking strength of the bag. What is the probability that the average breaking strength is between 5 and 5.5 pounds per squar
What is a point estimate of the P/E ratio for the population of stocks listed on the New York Stock Exchange? Develop a 95% confidence interval.
who have not defaulted have had at least 2 late monthly payments. Find the probability that a customer with 2 or more late payments will actually default on his payments and, in light of this probab
The moderate-risk and 20% of the high-risk drivers will have such an accident. If a driver has an at-fault accident in the next year, what is the probability that he or she is high-risk?
What is the probability that the person will purchase a car that averages between 25 and 29 miles per gallon for in-city driving?
A medical researcher is planning to select a large random sample of adult women to participate in a future study. What is the standard value, or z-value, for an adult woman who has a height of 68.5
Determine and plot the probability mass function and probability distribution function of the contract award amount (in millions of dollars).
The length of time for one individual to be served at a cafeteria is a random variable having a lognormal distribution with a mean of 10 minutes and standard deviation of 2 minutes. What is the prob