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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?
A sample of 40 decaffeinated-coffee drinkers showed a mean of 5.84 cups per day, with a standard deviation of 1.36 cups per day. Use the .01 significance level. Compute the p-value.
we want to take a sample of 100 items out of a large batch for quality control purposes. based on past history the
what is the major shortcoming of both the maximin and maximax criteria?please answer in at least 3 sentences but no
the following data show the number of fruit fly killed at varying concentrations of nicotine.the number of ies killed
What internal and external threats are and could you provide some examples of what would be considered a threat to internal and/or external validity of a study design.
given a sample size of 34 with sample mean of 660.3 and stand dev of 104.9 we have the hypotheseisnull is h0u700alt hyp
Same survey showed that average length of time each store was in business in 6 years, with standard deviation of 2.5 years. Which is more variable, number of magazines or number of years?
A survey of 85 families showed that 36 owned at least one DVD player. Find the 99% confidence interval estimate of the true proportion of families who own at least on DVD player.
How many units would have to be sampled to be 95% confident that you can estimate the fraction of defective parts within 2% (using the information from today's sample--that is using the result that )?
Let be the random variable that represents the number of cards that are drawn before the second appearance of an ace.- Find the probability mass function.-
The director of a state agency believes that the average starting salary for clerical employees in the state is less than $30,000 per year. To test her hypothesis
The estimated miles per gallon ratings of a class of automobiles are normally distributed with a mean of 12.8 and a standard deviation of 3.2. What is the probability that one of these automobiles selected at random would get:
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