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Suppose sps professors have an average life normally distributed of 82 years, with a population standard deviation of 5 years.
a. what percent of sps professors will make it past the age of 70?
b. what percent of sps professors will not live more than 80 years?
c. calculate the 95th percentile
d. what proportion of sps professors will live between 85 and 90 years?
Develop four probability questions using the table that you as an instructor of statistics might ask a class of students for a test in probability.
A bank wants to get new customers for their credit card. They try two different approaches in their marketing campaign. The first promises a "cash back" reward; the second promises low interest rates. A sample of 500 people are mailed the first br..
Do the association between the sizes of the heads and bodies of the two species appear to be strong? Explain.
If the mean times for both George and Julia are actually the same, what is the probability that George will be let go?
To test whether there is any association between two variables using Chi-Square test for independence.
Two t-curves have degrees of freedom 12 and 20, respectively. Which one more closely resembles the standard normal curve? Explain your answer.
A recent census of a small town in Michigan showed that 60% of the residents are male, 20% have college degrees, and 15% are both male and college graduates.
Suppose the world series is about to begin. Some people get together and each decide to predict different win-loss patterns for the seven possible games during the coming series.
Determine the probability of selecting sample with a mean of more than $100,000 but less than $112,000.
Small bag of Skittles candies has following assortment: red (12), blue (5), orange (15), brown (0), green (16), and yellow (7). Create the probability distribution for x.
In a marketing study, 100 consumers were asked to select the best digital music player from the iPod, the iRiver, and the Magic Star MP3. To summarize the consumer responses with a frequency table, how many classes would the frequency table have?
Explain why we need to use the t distribution. What assumption do you need to make?
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