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An accounting firm is hired to check the sales entries of a large corporation and their goal is to certify that less than 5% of the entries have errors. there are around i million entreis for them to check and it usually takes around 10 mnutes for them to check a single entry. How long would it take to compute the % of entries having errors if they check all million entries? How long would it take to estimate the % of entries having errors using a random sample big enough to get a margin of error less than 2%?
If the loss of weight of customers at the end of their first month is normally distributed with a mean of 6.7lbs and a standard deviation of 0.81lbs
At the 10% level of significance, is there sufficient evidence to indicate that more books are being loaned out per day, on the average?
If the Pearson Correlation is 0.18, what do we get, what is the value called, and what does it tell us?
Assume that waiting times are approximately normally distributed. Construct a 98% confidence interval for the population mean of waiting times.
Three scholarships are available for students. Their values are: $2,000, $2,400, $3,000. Twelve students have applied and no student may receive more than one scholarship. Assume all twelve students are in needs of the funds, how many different..
Assume that Leo advertises "If it takes more than 30 minutes to get your pizza, you get it free". What percentage of his take-out pizzas will have to give away free?
SOB's systolic blood pressure is a random variable with a mean of 145 mmHG and a standard deviation of 20mmHG. If the SOB's blood pressure is taken at a randomly chosen moment
White blood cell counts for a group of volunteers before being innoculated, and white blood cell counts for a second group of volunteers after being innoculated.
In a random sample of 225 students at a university, 180 stated that they were nonsmokers. Based on this sample, compute a 95% confidence interval for the proportion of all students at the university who are nonsmokers.
A researcher would like to determine whether an over-the-counter cold medication has an effect on mental alertness. A sample of n = 16 participants is obtained and each person
A point estimate for the difference between the mean purchases of the users of the two credit cards is:
An internal study by the Technology Services department at Lahey Electronics revealed company employees receive an average of 3.3 emails per hour. Assume the arrival of these emails is approximated by the Poisson distribution.
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