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At a certain university, the average attendance at basketball games has been 3325. Due to the dismal showing of the team this year, the attendance for the first 8 games has averaged only 2965 with a
Your desired margin of error is 40 and a pilot sample of 30 items indicates a sample standard deviation of 900. Determine the required sample size if the confidence level is 90%.
A poll is planned to determine what proportion of all students favor an increase in fees to support a new track and field stadium. A questionnaire will be published and the first 1000 completed que
To evaluate this, suppose that we measured the amount of time required to complete the procedure on each of 36 occasions.
Develop your own set of constraint equations and inequalities and use them to illustrate graphically each of the following conditions: (a) an unbounded problem (b) an infeasible problem (c) a proble
You notice at the gym that it appears more women tend to work out together, whereas more men tend to work out alone. To determine whether this difference is significant, you collect data on the work
Researchers have determined that patients who are smokers have 18% chance of contracting a serious illness, whereas only .06 probability that a non smoker will contract a serious illness.
one of the three vice-presidents has not beeninvitged to attend any of the last four games. what is the probability that this could happen?
The probability is 99% that the sample mean amount of soft drink will be at least how much?
Compute a 90% confidence interval for the population mean, based on the sample 25, 27, 23, 24, 25, 24, and 59. Change the number from 59 to 24 and recalculate the confidence interval.
If the sample standard deviation is 10.5 and the sample mean is 48 based on a study with a sample size of 120, what the 95 percent confidence interval about the mean is between approximately:
Compute the expected value of perfect information. Do you think it would be worth trying to obtain additional information concerning which scenario is likely to occur?
Based on the custom "rule-of-thumb" for estimating the standard deviation, if the range of prices for a product sold in Kansas City is between $99 and $349, what an estimate of the standard deviatio
If you randomly select 25 adult males what is the probability that the average cholesterol reading of your sample group will be greater than 253 mg/dL?
The life of a certain car battery is normally distributed with a mean of 4 years and a standard deviation of 0.5 years. The manufacturer will replace any defective battery free of charge while it i
if this same type of study conducted last year had a standard deviation of about $29.25, what the appropriate sample size for this study would be approximately:
An average value of 750 milliliters (ml) and a standard deviation of 10 ml. What is the probability that you might randomly select a sample that lies between 745 ml and 748 ml?
The probability that a radish seed will germinate is 0.7. A gardener plants seeds in batches of 6. That is he/she plants six seeds together in each hole. If the gardener plants 25 batches of 6 seeds
if the researcher wants to be 95 percent confident of the results with an error of plus or minus $2.15, what the appropriate sample size for this study would be approximately:
In one region, the February energy consumption levels for single-family homes were found to be normally distributed with a mean of 950 KWh and a standard deviation of 218 KWh. For a randomly selecte
If 35 percent of TV viewers recalled seeing an ad for a Ford Explorer on "The West Wing" based on a sample of 800 viewers, what the 95 percent confidence interval for this study would be between app
The probability the second truck is available is .50, and the probability that both trucks are available is .30. What is the probability neither truck is available?
Suppose a bookie will give you $6 for every $1 you risk if you pick the winner in 3 ballgames. For every $1 bet, you either lose $1 or gain $6. What is the bookie's expected earnings per dollar wag
A researcher used an anova to cmpare 4 treatment conditions with a separate sample of n=9 participants in each treatment. Calculate the missing values in the following. The F ratio is = 5.00 between
if the researcher wanted her error to be plus or minus 2.5 percent, the appropriate sample size would be approximately: