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Question: Response time at an online site can be modeled with an exponential distribution with a mean service of 5 minutes. John knows this and it is not sure to wait for an answer. What is the probability that for the reply to John's request.
(a) Will take longer than 10 minutes?
(b) Shorter than 10 minutes?
(c) If the mean service is now 2 minutes, what is the probability that it takes longer than 10 minutes?
Five children under twelve are selected at random. The probability that the average number of hours that they spend each week watching television is at least 30 is about?
Dr. Stallter has been teaching basic statistics for many years. She knows that 80 percent of the students will complete the assigned problems.
A researcher decides to test her hypothesis that some toys are more fun to play with than others, so she decides to compare fun toys or blocks with “un-fun” toys or stuffed animals
What score was earned by more students than any other score? Why? What was the highest score earned on the exam?
Would it be sensible to conclude that more than 10% of applicants are now failing the test?
Use the trend equation to calculate the points for 2003 and 2005. Plot them on the graph and draw the regression line.
With a mean of 1.30 inches and standard deviation of 0.04 inch. If you select a random sample of 16 Ping-pong balls, what is the sampling distribution of the mean?
For the binomial sample information summarized below, indicate whether the sample size is large enough to use the large sample approximation to construct a confidence interval for p.
in a randomized trial who should be blinded to which treatment group the patient is assigned?1. the patient2. the
Our psychology department received a new statistics text for review. Prof. Smart in his review provided an interesting table of corrections.
Compute variance, standard deviation, range, interquartile range, CV, and minimum and maximum Z scores. Are there any outliers? Explain.
The average monthly gasoline purchase for a family with 2 cars is 90 gallons. This statistic has a normal distribution with a standard deviation of 10 gallons. A family is chosen at random.
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