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The average stock price for companies making up the S&P 500 is $40, and the standard deviation is $10. Assume the stock prices are normally distributed. What is the probability a company will have a stock price less than $33.
Is this enough evidence to support Union's position? Use significance level of a = 0.05. You may suppose the mean annual salaries are normally distributed.
Since 38% is less than 40%, does this mean that immediate production cutbacks are needed or can this difference of 2 percentage points be attributed to sampling?
What is the distribution of sample means.
Construct the 95% confidence interval for the proportion of students with at least one injury.
An experiment consists of making 80 telephone calls in order to sell a particular insurance policy.
To find z-score and required probabilities based on Normal distribution. Assume that childrens weekly allowances are normally distributed in the population.
Create a stem-and-leaf display of these data. Create a box plot of these data.
The 95% prediction interval for a new patient with a 2-day cholesterol level of 220 is
Use the normal approximation to estimate the probability of at least one disaster in 25 missions.
A student team examined parked cars in four different suburban shopping malls. One hundred vehicles were examined in each location.
Note that under the exponential assumption, P(X>t) = exp(-t/theta). If t=5, use the result from (a) to find an approximate one-sided lower 95% confidence limit for theta.
if you sample 100 people and 20 turn out to be over 65 inches tall, you get $20. Which is better: a sample of size 100 or a sample of size 1,000? Choose one and explain. Does the law of averages relate to the answer you give?
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