A physical fitness association is including the mile run in its secondary-school fitness test for boys.  The time for this event for boys in secondary school is known to have a normal distribution with a mean of 450 seconds and a standard deviation of 50 seconds.  Find the probability that a randomly selected boy in secondary school can run the mile in less than 370 seconds.

Starting salary and GPA of students who graduate from OSU are examples of ____________ data.

Construct a large-sample 90% confidence interval for the true population proportion if the sample estimate of p is 0.30.  The number of observations in the sample is 100.

A farm supply store manager wants to predict monthly sales, Y, for her company using advertising expenditures, X.  She has collected 10 months of data on past performance as shown in the following table. Advertising expenditures, in thousands of dollars, X Monthly sales, Y XY X2 Y2 1.2 101 121.2 1.44 10,201 0.8 92 73.6 0.64 8,464 1.0 110 110.0 1.00 12,100 1.3 120 156.0 1.69 14,400 0.7 90 63.0 0.49 8,100 0.8 82 65.6 0.64 6,724 1.0 93 93.0 1.00 8,649 0.6 75 45.0 0.36 5,625 0.9 91 81.9 0.81 8,281 1.1 105 115.5 1.21 11,025 TOTAL 9.4 959 924.8 9.28 93,569 The store manager performs a regression analysis and derives the following equation. Y =

What are the 3 measures of central tendency?

If the variation within sample means is large relative to the variation between the samples, it indicates that there is a real difference between the population means.

Suppose x has a binomial probability distribution with n = 200 and p = 0.70.  Use the normal approximation to the binomial to find P (X > 150).

The American Journal of Orthopsychiatry published an article on the prevalence of homelessness in the United States.  A sample of 500 adults was asked to respond to the question:  “Was there ever a time in your life when you did not have a place to live”?  A total of 30 adults in the sample answered yes to this question. Is the sample size in this problem large enough for large-sample confidence interval procedures to be valid?

Suppose x has a binomial probability distribution with n = 200 and p = 0.60.  Use the normal approximation to the binomial to find P (X 

Suppose that a veterinarian has received permission from the owners of 50 dogs to use their dogs in an experiment involving a new drug for cancer treatment.  The vet decides to use 5 of the 50 available dogs for a small preliminary experiment before conducting a larger study.  The vet arbitrarily begins at row 8 column 1 of the random number table and goes from left to right across the row.  Which one of the following is the correct random sample of 5 dogs? For your convenience, here are rows 8 and 9 of the random number table:       Column       Row 1 2 3 4 5 6 8 96301 91977 05463 07972 18876 20922 9 89579 14342 63661 10281 17453 18103