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A random survey of 30 countries across the world yielded an average life expectancy of 62 years with a standard deviation of 6 years. Construct a 98% confidence interval for the average life expectancy of countries around the world. The data appear to be normally distributed.
For the most recent year available the mean annual cost to attend a private university in the US was $26,889. Assume the distribution of annual costs follows a normal probability distribution and the standard deviation is $4,500. 95% of all studen..
Using one proportion z test to find whether or not to support the claim - There is little evidence to reject H 0 , therefore they conclude the tvs are 20 pounds on average.
In a high school graduating class of 100 students, 42 studied math, 68 studied psychology, 54 studied history, 22 studied both math and psychology, 7 studied history and neither math nor pyschology, 10 studied all three and 8 did not take any of t..
If you arbitrarily grab 2 socks out of drawer determine the probability that you grab a matching pair?
At the 5% significance level, can the researcher reject the hypothesis that the mean reading scores of all children in the three school systems is the same ? Formulate and test the appropriate hypotheses. Use the critical value approach.
Compute 99% confidence intervals for the average daily maximum temperature in August for each of the three years in which you collected data. How do they compare?
Set up the null and alternative hypotheses for Coca-Cola. In terms of Coke's decision to introduce the new bottle or not, what is a Type I error?
An insurance representative wants to determine if the proportions of women and men who buy the different policy types are the same. The actual sales results for 50 women and 50 men are
Using the paired t test because the samples are correlated with each other could be another avenue. This would help us find the p-value and look at the statistical significance in evaluating the quality of care or outcomes in a medical home.
Following are different algebraic expressions of the production function. Decide whether each one has constant, increasing, or decreasing returns to scale.
Compute the z score corresponding to each of the following values of x. Compute the z score corresponding to each of the following values of x
A manuscript is sent to a typing firm consisting of typists A, B, and C. If it is typed by A, then the number of errors made is a Poisson random variable with mean 2.6; if typed by B, then the number of errors is a Poisson random variable
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