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A state university uses thousands of flourescent light bulbs each year. The brand of bulb it currently uses has a mean life of 800 hours. A competitor claims that its bulb, which cost the same as the brand the university uses, have a mean life of more than 800 hours. The university has decided to...
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A random sample of 41 observations was selected from a normally distributed population. The sample mean was x bar= 60, and the sample variance was s2 = 21.0. Does the sample show sufficient reason to conclude that the population standard deviation is not equal to 6 at the 0.05 level of...
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a random sample of 35 observations was selected from a normally distributed population. the sample mean was x-bar=51, and the sample variance was s^2=16.0. does the sample show sufficient reason to conclude that the population standard deviation is not equal to 3 at the 0.05 level of...
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In a state of 10 million people, 20% of all voters are Democrats. If two voters are randomly selected for a survey, find the probability that they are both Democrats.
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How to analysis Likert Scale data?
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The following frequency distribution shows the time (in minutes) that a sample of students uses the computer terminals per day (Give your answers in minutes). Time Frequency 20 - 39 2 40 - 59 4 60 - 79 6 80 - 99 4 100 - 119 2 a. Compute the mean, the...
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1. A machine produces 5-inch nails. A sample of 12 nails was selected and their lengths determined. The results are as follows: 4.85 4.80 4.89 4.82 4.94 4.96 4.96 4.83 4.80 4.84 4.95 4.88 Assuming that = 0.10, test the hypothesis that the population mean is equal to 5. State...
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Determine the range and the standard deviation of the checking account balances. What do the first and third quartiles show? Determine the coefficient of skewness and indicate what it shows. Because Mr. Selig does not deal with statistics daily, include a brief description and interpretation of...
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Assume the number of minutes of cell phone use is a normal distribution with a population mean of 200 minutes and a population standard deviation of 50 minutes. What percent of the population talk between 175 minutes and 245 minutes?
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I have no idea what test to run on these 5 questions. HELP PLEASE 1. Do people with different attachment styles report different mean levels of introversion? 2. Do people with different attachment styles report different mean levels of life satisfaction? 3. Do...
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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?
- 2. What are the steps espoused by Applied Statistics in Business and Economics for formal hypothesis testing? Why is the sequence important?
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