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Question: Movie lengths. The histogram shows the running times in minutes of 122 feature films released in 2005.
a) You plan to see a movie this weekend. Based on these movies, how long do you expect a typical movie to run?
b) Would you be surprised to find that your movie ran for 2 1/2 hours (150 minutes)?
c) Which would you expect to be higher, the mean or the median run time for all movies? Why?
according to the u.s. national center for health statistics 25.2 percent of men and 23.6 percent of women never eat
What is the difference between a qualitative variable and a quantitative variable? When would each be appropriate?
An experiment produces a zero mean Gaussian random vector X = [X1 ··· Xk] with correlation matrix R = E[XX']. To estimate R, we perform n independent trials, yielding the iid sample vectors X(1), X(2), . . . , X(n), and form the sample correlation..
in a survey of 2365 adults a proportion of 1320 said they worry about zombies.a. find p and q.b. with c0.99 construct
Computer anxiety and usage frequency. Using a rating scale, Tekinarslan (2008) measured computer anxiety among university students who use the computer.
the flavor of gum that is purchased. Determine the test value for the data given type number sold spearmint 25 wintergreen 32 cherry 18 cinnamon 43.
Compare the women to the men using a dotplot. What does your plot show you about the difference between the men and the women?
Let X and Y be independent random variables with mean j and k and variances m^2 and n^2. Find an expression for the correlation of XY and Y in terms of these means and variances.
What proportion of the variation in listing price is determined by variation in the square footage? What proportion of the variation in listing price is due to other factors?
An important application of sensitivity analysis occurs in problems involving multiple attributes. Many decision makers experience difficulty in assessing trade-off weights.
The data file also contains data concerning the median selling price ($thousands). Construct a graph containing the line plot for both the number of sales.
Why does one use a Tukey's HSD rather than a t test when comparing mean differences in ANOVA?
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