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1) A store has determined that 25% of all sales are credit sales. A random sample of 75 sales is selected. What is the probability that the sample proportion will be:
a) greater than .34?
b) between .196 and .354?
c) less than .25?
d) less than .10?
2) 10% of items produced by a machine are defective. A random sample of 100 items is selected and checked for defects. What is the probability that the sample will contain:
a) more than .025?
b) less than .13 defective units?
What is wrong with this design? What confounds could be leading to the results of improved memory and problem-solving skills?
A small New England college has a total of 400 students.The Math SAT is required for admission, and the mean score of all 400 students is 620. The population standard deviation is found to be 60. The formula for a 95% confidence interval yields th..
At a state political rally, a spaker announced "we should raise test scores so that the students are above the state median". How would you analyze this statement?
Grindit & Floggit Ltd. make customized Widgets at a cost of $150 per unit of which 3% (on average) happen to be out of tolerance. Up to 115 Widgets can be produces in one continuous run whose set up incurs an additional cost of $10 000.
Extra college-level training, and rest of the sailors arn't accounted for. How does your sample compare to what you expected to determine? Define null hypothesis.
The personnel director of Cander Machine Products is investigating perfectionism on the job. A test designed to measure perfectionism was administered to a random sample of 18 employees.
Of the 1,4000 homemakers sampled, 420 were able to identify the brand by name. Compute the standard error of the proportion.
Below are the sample times in minutes. At the .05 significance level, can we conclude that there is a difference in their mean times?
Agricultural researchers are studying three different ways of planting peanuts to determine whether significantly different levels of production yield will result.
Think about a density curve that consists of two line segments. The first goes from the point (0, 1) to the point (0.7, 1). The second goes from (0.7, 1) to (0.9, 2) in the xy-plane. What percent of observations fall below 0.70?
What is the probability of selecting a store at random and finding it has both a pharmacy and a floral shop?
Since she is allowed to reserve one time if her first serve is out what should her serving strategy be?
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