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A researcher claims that the average age of people who buy lottery tickets is 70. A sample of 30 is selected and their ages are recorded as shown below. The standard deviation is 16. At alpha = 0.05 is there enough evidence to reject the researcher's claim?
49 63 90 52 22 80 72 56 82 56
24 46 70 74 70 61 65 71 39 74
79 76 71 49 62 68 71 67 69 45
What is the computed z-value for testing the null hypothesis that the proportion of successes in Population 1 exceeds the proportion of successes in Population
Consider binomial distribution with 14 identical trials, and probability of success of 0.4.
Is it sensible to conclude that mean weekly salary of school teachers is lower at .05 level of significance? Explain why?
Does your analysis change if the term "average" refers to the mean? To the median? Explain what effect this misinformation might have on the perception of the nation's schools.
Salary information for a random sample of male and female employees of a large company is shown below.
Assume X is an exponential random variable with parameter lambda. Find the method of moments estimator for lambda.
There is a statistical deception here. Explain what is deceptive about the bar graph.
Further, 20 students get both questions 1 and 2 incorrect, 15 get both questions 2 and 3 incorrect, and 8 get both questions 1 and 3 incorrect, and 7 get all three questions incorrect. Find the probability that a randomly selected student: a) Gets..
A senior accounting major at Midsouth State University has job offers from four CPA firms. To explore the offers further, she asked a sample of recent trainees how many months each worked for the firm before receiving a raise in salary.
The manager requires the estimate to be within 1.0 minutes of the population value. What sample size is needed?
Estimating the sample standard deviation using normal score - Find the sample standard deviation?
You're asked to determine whether the workers live in the community. Your personnel department provides the following table:
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