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A random sample of 10 miniature Tootsie Rolls was taken from a bag. Each piece was weighed on a very accurate scale. The results in grams were
3.087 3.131 3.241 3.241 3.270 3.353 3.400 3.411 3.437 3.477
(a) Construct a 90 percent confidence interval for the true mean weight. (b) What sample size would be necessary to estimate the true weight with an error of ± 0.03 grams with 90 percent confidence?
(c) Discuss the factors which might cause variation in the weight of Tootsie Rolls during manufacture.
Farley purchases and pays for merchandise 60% in the month of acquisition and 40% in the following month. Accounts payable is used only for inventory acquisitions. How much cash will Farley receive during November?
The length of pregnancies are normally distributed with a mean of 268 days and standard deviation of 15 days. How many days do 80 percent of women last until in their birthing process?
A population has a mean = 80, with standard deviation = 8. The distribution of sample means for samples of size n = 4 selected from this population would have an expected value of?
If two gloves are randomly selected from the box, without replacement (the first glove is not returned to the box after it is selected), what is the probability that both gloves selected will be right-handed?
There are four conditions/requirements that must be met in order to perform simple linear regression. For each of the conditions below, choose the technique that should be used to determine whether or not that the condition is met.
A random variable is binomially distributed with n = 16 and π = .40. The expected value and standard deviation - find the sample size to estimate the mean with an error of ± 4 and 95 percent confidence (rounded to the next higher integer).
The university police department must write, on average, five tickets per day to keep department revenues at budgeted levels. Suppose the number of tickets written per day follows Poisson distribution with a mean of 9 tickets per day.
Someone gives you 10 to 1 odds that you cannot roll a double number with the roll of a pair of dice. You win $10 if you succeed and you lose $1 if you fail. What is the expected value of the game for you? What can be expected if you play 100 times..
If three systems are installed, what is the probability that at least one of the systems will detect the attack? Would you recommend that multiple detection systems be used? Explain.
Using the following number of flirtations actions in the 4 hour period, test the "null hypothesis'
What is the critical value at .1 significance? Can we conclude the mean lifetime of light bulbs made by this manufacturer differs from 48 months?
Pearson correlation coefficient was 0.61.a. Was the correlation coefficient significantlydifferent from zero? Use α = 0.05.b. Predict the torque for a current equal to 50 mA.
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