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The standard deviation of test scores on a certain achievement test is 11.3. If a random sample of 81 students had a sample mean score of 74.6, find a 90 percent confidence interval estimate for the
Evergreen Fertilizer Company produces fertilizer. The companyâs fixed monthly cost is $25,000, and its variable cost per pound of fertilizer is $0.15. Evergreen sells the fertilizer for $0.
21 said they planned to work in a rural community. Find a 95% confidence interval for the true proportion of all medical students who plan to work in a rural community.
of the graduates of a university 30% will receive a starting salary of 30,000 or more if 5 of them are selected at random find the probability that all had a strating salary of 30,000 ?
How large a sample should be taken to estimate the proportion of smokers in the population with a margin of error of .02? Use 95% confidence.
The population mean height of a basketball player is 220 cm with a standard deviation of 20 cm. In a sample of 49 basketball players, what is the probability of getting a sample mean height of 215 c
The probability that a randomly chosen student of the University of New Harmony is a woman is 0.6. The probability that the student is studying education is 0.15. The conditional probability that th
How large a sample should be taken for a 99% level of confidence? Use planning value for the population standard deviation of either minutes.
The average weight of packages shipped by a courier company is 75 kg with a standard deviation of 5 kg. In a sample of 200 packages, what is the probability of getting a sample mean between 74 and 7
From a group of six people, two individuals are to be selected at random. How many possible selections are there?
An experiment consists of selecting a student body president and vice president. All undergraduate students (freshmen through seniors) are eligible for these offices. How many sample points (possibl
Describe each set of data with a histogram (use the same class intervals on both histograms) the mean, standard deviation.
Three applications for admission to a local university are checked, and it is determined whether each applicant is male or female. what is the number of sample points in this experiment ?
Assume your favorite football team has 2 games left to finish the season. The outcome of each game can be win, lose or tie. what is the number of possible outcomes ?
Determine if your survey questions are appropriate for researching your business problem, and explain why they are. Explain which ethical implications must be considered when developing survey questio
Each customer entering a department store will either buy or not buy some merchandise. An experiment consists of following 3 customers and determining whether or not they purchase any merchandise.
An experiment consists of three steps. There are four possible results on the first step, three possible results on the second step, and two possible results on the third step. what is the total num
assume that 75%of the AP stat students studied for this test. if 40% of those who study get an A, but only 10% of those who don't study get an A, what is the probability that someone who gets an A a
The distribution of the weights is approximately normal. The average weight is 215 pounds and the standard deviation is 15 pounds. Approximately how many players had weights between 215 and 225 pound
Mean of 94 inches, and a standard deviation of 14 inches. What is the probability that the mean annual snowfall during 49 randomly picked years will exceed 96.8 inches?
The mean for statistics is 61 and the standard deviation is 6.0. For the biology test scores, the mean is 24 and the standard deviation is 3.8. The test scores of a student who took both tests are g
In a survey of 600 senior business executives by Business Week magazine, 52% indicated that they felt that even if merit and abilities are equal, people with MBAs often get promoted faster than peop
a mandatory competency test for high school students has a normal distribution with a mean of 400 and a standard deviation of 100. scores are whole values. the top 3% receive $500.00. what is the mi
The mayor of a small town would like to know whether a local bond issue is likely to pass or not. He mails a survey to 500 randomly selected voters. How many returns must he get in order to know the
Assume the population standard deviations are not the same. At the .05 significance level, is there a difference in the mean waiting time?