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The race times for a mile long race of boys in secondary school is known to be distributed normally with mean. what time seperates the shortest 90% of race times from the longest 10%?
How many commuters must be randomly selected to estimate the mean driving times of Chicago commuters? If we want 99% confidence.
If a member of the sales force submits an entertainment expense (dinner cost for four) of $190, should this expense be considered unusually high (and possibly worthy of investigation by the company)
Comparing the amount of money people spend and the amount people save, your analysis revealed an R-squared=0.97. Should you use this for predictive purposes and why?
Construct a boxplot and check for outliers. If there is/are outliers delete it/them and use the resulting dataset for question 4 and 5.
The manager of a plant supply store wants to determine whether the mean amount of paint contained in 1 gallon cans purchased from a nationally known manufacturer is actually 1 gallon. You know from
What can you conclude from Chebychev's theorem about the percentage of adults in the town whose heights are between 59.7 and 72.9 inches.
For a recent year, the mean fare to fly from Charlotte, North Carolina, to Seattle, Washington. At the .01 significance level, can we conclude that the mean fare has increased? What is the p-value?
The average diameter of sand dollars on a certain island is 4.00 centimeters with a standard deviation of 1.00 centimeters. If 36 sand dollars are chosen at random for a collection, find the probabi
Only 50% fill their tanks (event B). Of those customers using extra unleaded or premium gas, 60% fill their tanks. What is the probability that the next customer fills the tank?
There is a 0.71 probability that jill is ranked next weekon the WTA circuit. What is the probability that the current player does not reach the semifinals given that jill reaches the final?
In a sample batch of 34 mechanical pencils it is assumed that 9 are defective. If 5 mechanical pencils are randomly selected, what is the probability that none of them are defective?
According to police sources a car with a certain protection system will be recovered 91% of the time. Find the probability that 5 of 8 stolen cars will be recovered.
Suppose your instructor randomly surveyed his or her performance (i.e., students "graded" the teacher) over many years (assume an 'infinite' population). Can you describe a chi-squared application
Some filters allow the user (that's you) to adjust the cutoff. Suppose your filter has a default cutoff of 50 points, but you reset it to 60. Is that analogous ot choosing a higher or lower value of
Seven students have applied for merit scholarships. what is the probability that no students were the recipients of the scholarship?
In testing the difference between the means of two normally distributed populations using large, independent random samples with known variances. When comparing two independent population variances,
The campus vets club is having a raffle and is selling 1,700 tickets. If the people on your floor of the dorm bought 425 of those tickets, what is the probability that someone on your floor will hol
A food distributor carries 64 varieties of salad dressing. Appleton Markets stocks 48 of these flavors. Beacon Stores carries 32 of them. The probability that a flavor will be carried by Appleton or
If the test contains 250 questions, what is the probability that Julie will score 75% or lower? (Use the normal approximation to the sampling distribution to solve this problem.)
The length of human pregnancies is approx. normally distributed (ND) with mean of 266 days and standard deviation of 16 days. Find the probability that a pregnancy will (a) last more than 300 days; (b
One state lottery has 500 prizes of $1, 75 prizes of $15, 15 prizes of $100, 5 prizes of $450, 2 prizes of $1225, and 1 prize of 2500.
Determine how many waiters and busboys should report for work at the start of each time period to minimize the total staff required for one day's operation.
The administration of a large university wants to estimate what proportion of their full time engineering students are female. If she obtains a random sample of a 100 engineering students from the d
Demand for the product is best described by a normal probability distribution with a mean of 1200 units and standard deviation of 300 units. Develop a spreadsheet simulation. Use 500 simulation tria