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For the following numbers what is the 25th percentile? 27, 25,20,10,12,14,17,19
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. A standard placement test has a mean of 115 and a standard deviation of = 10. Determine the minimum sample size if we want to be 90% certain that we are within 2 points of the true mean
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if the test value for the difference between the mean of two large samples is 2.57 when the critial value is 1.96 what decision should be made.
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Select three situations in psychology where you, the research psychologist, would be concerned about effect size in your research endeavor. Make sure to present the rationale for your selection, as well as the appropriateness of your selection. This is for psychological statistics. Can you...
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An insurance firm has five salespeople that they want to assign to five sales regions. Because of previously acquired contacts, each salesperson's efficiency in covering each region varies in terms of expected sales. The estimated sales per month (in thousands) by each...
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Yankee Hill Stone Co has a contract to supply gravel for all road repairs. The company maintains 3 stockpiles, each containing the following amounts of gravel: #1-100 tons, #2-60 tons #3-80 tons. Because of recent flooding, many roads need repair. The company has rcvd...
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1. Explain the difference between a population and a sample. In which of these is it important to distinguish between the two in order to use the correct formula? mean; median; mode; range; quartiles; variance; standard deviation. 2. The following numbers represent the weights in pounds of...
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A drug manufacturer wants to estimate the mean heart rate for patients with a certain heart condition. Because the condition is rare, the manufacturer can only find 14 people with the condition currently untreated. From this small sample, the mean heart rate is 101 beats per minute with a...
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A bowler who has averaged 196 pins in the past year is asked to experiment with a ball made of a new kind of material. If he rolls 25 games with the new ball, averaging 204 pins with a standard deviation of 24.9, can one conclude at a level of significance of .01 that the new ball has improved...
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If the variance is 846, what is the standard deviation?
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- 1. A school administrator wonders if students whose first language is not English score differently on the math portion of the sat exam than students whose first language is English. The mean SAT math score of students whose first language is english is 516 on the basis of data obtained from the college board. A simple random sample of 20 students whose first language is not English result in a sample mean SAT math score of 522. SAT math score are normally distributed with a population standard deviation of 114. Why is it necessary for SAT math scores to be normally distributed to test the hypothesis?
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