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One hundred items are simultaneously put on a life test. Suppose the life-times of the individual items are independent exponential random variables wih mean 200 hours. The test will end when there have been a total of 5 failures. If T is the time at which the test ends, find E[T] and Var(T).
A sample of 23 European countries found that the variance of life expectancy was 7.3 years. What is the 95% confidence interval estimate for the variance of life expectancy in Europe?
Think about a real world situation or problem that could be addressed using a single-sample t test. For this situation or problem, clearly identify the independent and dependent variables you would study
Sat verbal scores are normally distributed with a mean of 426 and a standard deviation of 94. Use the Empirical Rule to determine what percent of the scores lie between 332 and 426.
Which of the following methods could be used to determine future order quantities? forecasting, regression, inventory models.
$240 per hour for hours spent in court, $150 per hour for consultations, and $210 per hour for depositions. What is her averages per hour for this week?
Write a brief summary report on the demographic and class distribution of this sample. Paste the tables and charts into your report and label each of them properly.
What different types of variables are used in quantitative studies? Describe each type of variable and how they differ.
Bags of tea are sampled to ensure proper weight. The overall average for samples is 8 ounces. Each sample contains 10 bags. The average range is 0.1 ounces.
Discuss how t test can be employed in hypothesis testing by the use of directional vs. nondirectional hypotheses. Discuss types of research where using the t statistic may be an appropriate alternative to using a z-score.
How many people must be surveyed if we want to estimate the percentage who weigh more than 180 pounds? Assume that we want 96% confidence.
A shoe salesman want to see if his female customers have a preference in the color of shoe purchased. What is the test value for the following data?
Compute the value of the sample correlation coefficient between weekly sales and shelf space. Is the correlation between weekly sales and shelf space significant at the .01 level of significance? What is the estimated regression equation?
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