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1) Suppose that a standard deviation is known to be 3. How large a sample size is needed to have an error of 2 on a 99% confidence interval?
2) If n= 48 packages are randomly selected from packages received by parcel service. The sample has a mean weight of 18.6 lbs. Assume that s=3.4 lbs. What is the 95% confidence interval for the true mean weight of all packages received by the parcel service?
a) 17.8-19.4 lbsb) 17.6-19.6 lbsc) 17.3-19.9 lbsd) 17.5-19.7 lbs
3) A random sample of 150 visitors to a park spent an average of $142 with a standard deviation of $47.50. Determine the 98% confidence interval for the mean money spent by all visitors to the park.
4) A marketing survey reveals that 58 out of 750 randomly selected shoppers is an extreme couponer. Find a 95% confidence interval for the population proportion of extreme couponers.
5) A random sample of n= 40 farming regions was selected to receive an average price of $9.75 with a standard deviation of $1.85 per 100 lbs of watermelon. Find a 90% confidence interval for the population mean price per 100 lbs of watermelon.
it is decided to measure the resistance of sheets of a certain metal at temperatures x of 100k 200k 300k 400k and 500k.
Find the probability that the first ball drawn is red and the second ball drawn is green. Place your answer, rounded to 4 decimal places, in the blank.
What percentage of men are too tall to fit through a standard doorway without bending, and what percentage of women are too tall to fit?
The heights of 40 randomly selected people and the heights of their mothers are recorded. Statdisk is used to run a linear correlation and regression analysis. The partial results are provided below:
What do we need to consider when we try to select a test? Choose one of the tests; discuss your understandings of that test.
Assume that random variables X1,.....,X50 are independent and all have probability density function fX(x) = 1/x for 1
A 95% confidence interval for the average difference between the two reaction times (traditional - LED) was (-171.37, 174.44). Which of the following is the appropriate conclusion?
a professor gives tests that are either hard medium or easy. if she gives a hard test her next test will be either
1. in a taste test between coke c and pepsi p a random sample of 15 students gave the following preferences c c p
assume that iq scores are normally distributed with a standard deviation of 15 points and a mean of 100 points. if 100
Madlem, Inc., produces and sells a single product whose selling price is $240.00 per unit and whose variable expense is $86.40 per unit. The company's fixed expense is $720,384 per month.
Enter relative proportions of the 3 samples in order (20,50,30) in "Expected values" area.
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