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The label on 1-gallon cans of paint states that the amount of paint in the can is sufficient to paint 400 square feet. However, this number is quite variable. In fact, the amount of coverage is known to be approximately normally distributed with a standard deviation of 25 square feet. How large a sample should be taken to estimate the true mean coverage of all 1-gallon cans to within 5 square feet with 95% confidence?
A researcher believes that the percentage of people who exercise in California is greater than the national exercise rate. The national rate is 20%. The researcher gathers a random sample of 120 individuals who live in the California and finds tha..
A survey of the residents of a new subdivision on why they happened to select that area in which to live. You also wish to secure some information about what they like and do not like about life in the subdivision.
The daily numbers of calls received by the Internal Revenue Service office in July are shown below:
Use the sales data given below determine: a) The least square trend line.
What can we say about the probability distribution of x? Is it approximately normal? What are the mean and standard deviation?
Is there sufficient evidence to support the claim that site has an effect on the amount of pesticide?
In a bumper test, three types of autos were deliberately crashed into a barrier at 5mph, and the resulting damage (in dollars) was estimated. Five test vehicles of each type were crashed, with the results shown below. Are mean crash damages the sa..
The events are defined as follows: Let A be the event that the player selected has a number from 1 to 8. Let B be the event that the player selected is a guard. Let C be the event that the player selected is a forward. Let D be the event that the pla..
Inverse probability based on normal distribution - The data set has a bell-shaped distribution. Between what two prices do 68% of the houses lie?
At the .05 significance level, can we conclude that the mean waiting time is less than 3 minutes?
It has been claimed that women live longer than men; however, men tend to be older than their wives. Ages of sixteen husbands and wives from England were obtained. These data should be analyzed with a
Assume you choose 20 houses at random. On average, how many houses of twenty would you expect to have DVD? Determine standard deviation of number of houses with DVD?
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