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1. The president of a certain university makes three times as much money as one of the department heads. If the total of their salaries is$ 200.000, find each worker's salary
2. Including a 6.1% sales tax, a diamond ring sold for $ 2,864.70. Find the price of the ring before the tax was added.( round to the nearest cent).
3.Judy has a rectangular garden 10 by 30 feet. She wants to put a grass border around the garden with a uniform width on all sides. If she has enough grass seed to cover 384 square feet, how wide can the grass border be?
4. An auto repair shop charged a customer $424.00 to repair a car. THE BILL LISTED $74 for parts and the remainder for labor. If the cost of labor is $35 per hour , hoe many hours of labor did it take to repair the car?
In the past, of all the students enrolled in "Basic Business Statistics" 10% earned A's 20% earned B's, 30% earned C's, 20% earned D's and the rest either failed or withdrew from the course.
Genzero Pharmaceuticals developed the following regression model based on time series data from the past 33 quarters, for one of its non-prescription cold remedies:
A loaf of bread is normally distributed with a mean of 22 oz. and a standard deviation of 0.5 oz. What is the probability that a loaf is less than 22.25 oz.?
In looking at your business, when and why would you want to use a one-sample mean test (either z or t) or a two-sample t-test? Create a null and alternate hypothesis for one of these issues. How would you use the results?
How large random sample of potential voters will be required to evaluate result with 95% confidence and with margin of error of plus and minus 3%?
The mean weight of newborn infants at a community hospital is 6.6 pounds. A sample of seven infants is randomly selected
Determine margin of error was used in creating confidence interval above? Determine the sample size required to obtain the margin of error of 10.97 with 90% confidence interval?
A random sample of n=31 households is asked the number of TV sets in the household. The responses are-What is the mean number of TVs?
Briefly explain how sample size affect outcome of hypothesis test. How does sample size affect measures of effect size?
In a mobile phone shop on a Sunday morning, out of n = 77 customers x = 19 buy a mobile phone. What is the 95% confidence interval for the proportion of customers buying a mobile phone?
How many cans of paint should the sample contain if the researcher wants to be 98% certain of being within one percentage point of the true proportion of this chemical?
A survey covering 0 different suburbs in Dallas found the average price of gasoline to be $3.924 per gallon with a population standard deviation of $0.053. What critical value shoiuld be used to test the claim using a = 0.01?
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