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In the past, monthly sales for HOOPS, a small software firm, have averaged $20,000 with standard deviation $4000. During the last year sales averaged $22,000 per month. Does this indicate that monthly sales have changed (in a statistically significant sense)? Use 0.05. Assume monthly sales are normally distributed.
A leasing firm claims that the mean number of miles driven annually,u , in its leased cars is less than 13500 miles. A random sample of 70 cars leased from this firm had a mean of 13207 annual miles driven.
Determine the probability that a randomly selected exam will have a score of at least 71? What percentage of exams will have scores between 89 and 92?
What is the probability that among 10 true hypertensives at least 50% are being treated appropriately and are complying with this treatment?
Determine 80% confidence interval for average weights of Allen's hummingbirds in study regions. Determine the margin of error?
Provide a 99% confidence interval for the population proportion of college students who worked to pay for tuition and living expenses.
Suppose that you have a bag filled with 50 marbles, 15 of which are green. What is the probability of choosing exactly 3 green marbles if a total of 10 marbles are selected?
The average for the test is a 1700 and the population's standard deviation is 50. what percentile rank of students is Logan in based on her SAT score.
The R.R. Bowker Company of New York collects information on the retail prices of collectible children's books and publishes its findings in Publisher's Weekly.
The overall average for the samples is 17 ounces. The range is only 0.5 ounce. Determine the upper and lower control-chart limits for averages for the boxes of cereal.
Monthly sales figures for store are as follows. Determine the:Mid-rangeStandard Variance.
At.05 level of significance, is there evidence to propose that mean life length of the batteries manufactured by this manufacturer is more than 400 hours?
If probability of drawing a face card is 0.625. Determine the probability of not drawing a face card.
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