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50% of the cars in a dealer lot are red, 20% are black, and 16% are white. The remainder are some other unspecified color.
Salespersons randomly shows three cars to three different customers.
What is the probability the first car shown was red, the second was black, and the third was red again?
To be clear, the first red car and the second red car may be the same car. This is called sampling with replacement.
Use 4 decimal digits.
A ratings service would like to know, within 5 percentage points and with 95% confidence, the percentage of these households who tune in to the first episode of a network miniseries. How many television households must be included in the sample?
A bag contains four chips of which one is red, one is blue, one is green, and one is yellow. A chip is selected at random from the bag and then replace
A height sample of 50 people from this office has a mean of 185 cm. Which number is m and which is x?
What total size sample would be necessary if we wanted to estimate the true proportion to within ±0.08 using 90% confidence?
Describe a completely randomized design for this experiment.- Describe a matched-pairs design for this experiment.
What statistical test would you use?- What is the null hypothesis? The research hypothesis?- What is the Type I error? The Type II error?
What would happen if the forest service agent took another sample of 31 trees? Would the slope change? Would the intercept change? What about a third sample of 31 trees?
Use this example to discuss the importance of making the distinction between the common use and the statistical use of the word significant.
Determine the Efficiency of this market research. What would be your suggestions? How much will this company be eager to pay for this market research?
A national water expert is interested in determining the average amount of lead (in ppm, parts per million) that is found in the Houston, Texas drinking water. To conduct her research, she considers only those residential households within the city l..
State the main points of the Central Limit Theorem for a mean. Why is population shape of concern when estimating a mean? What does sample size have to do with it?"
A cheerleading squad received a mean rating (out of 100 possible points) of 75 ± 12 (!l ± cr) in competitions over the previous three seasons.
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