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Find the weighted mean of three test scores for a student (85, 90, 75) where the first test counts for 20%, the second test counts for 30%, and the third counts for 50% of the final grade.
Twelve cases of leukemia are reported in people living in a particular census tract over a 5-year period. Is this number of cases abnormal if only 6.7 cases would be expected based on national cancer-incidence rates?
The calculated chi-square test statistic and the table value for a 0.05 significance level are:
The ACT is an exam used by colleges and universities to evaluate undergraduate applicants. The test scores are normally distributed. In a recent year, the mean test score was 21.1 and the standard deviation was 5.0.
Conduct a hypothesis test to determine if the average cardiac outputs measured by the two evaluators differ. Use a significance level of 0.02.
If employee is chosen at random, determine these probabilities.The Employee smokes, The employees smokes, given that he/she graduated from college.
Find the prediction equation for the price of a laptop using rating and features. What is the value of the residual standard deviation?
Given this information, what would sampling error be if sample including seven values in top row were used to calculate sample mean?
What is the probability that a randomly chosen employee is an Administrator if the employee has the opportunity of gaining promotion next year?
Environmental Protection Agency (EPA) fuel economy estimates for automobile models tested recently predicted a mean of 24.80 mpg and a standard deviation of 6.2mpg for highway driving. Assume that a normal model can be applied.
A vertical line is drawn through a normal distribution at z = -0.25, and separates the distribution into two sections. What proportion of the distribution is in the larger section?
Which test do we use to see if the difference in our sample is statistically significant? Why? Should it be one or two-tailed?
Normal adult Mean Temperature is 98.2 and standard deviant is 0.62 with normal distribution. If 16 people are randomly selected determine the probability that their mean body temp is below 98.5 degrees.
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