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Scores on a national exam assume a normal distribution with a population mean of 50 and population standard deviation of 10 points. A sample of 36 exam scores was selected from UCA with a mean score of 58 points. Using a significance level of 0.01, determine whether scores on the exam have actually increased, statistically. What is the null hypothesis?
a random sample of 109 light bulbs had a mean life of x558 hours with a standard deviation of o32 hours. construct a
What is the probablity that there are no tremors in a 1-month period? What is the probability tha there are more than 5 tremors in a 6-month period?
During the last year sales averaged $22,000 per month. Does this indicate that monthly sales have changed (in a statistically significant sense)? Use 0.05. Assume monthly sales are normally distributed.
consider the normal curve in the figure to the right which gives relative frequencies in a distribution of mens
suppose a bar buys 10 of these sony tvs what is the probability that the average life time of the bar's tv is less than 19,650 hours.
a sample of 200 rates of return on real estate investments was computed and recorded. the sample mean is calculated to
Since you have a significant effect you would need to run post-hocs here. Please determine the appropriate post-hoc for this situation and report the results in proper APA format.
Random variable with mean of 10 and standard deviation of 2.4. Over the course of the next year, what is the probability that you average more than 11 games a month?
in one trip of a cruise ship 341 of the 3745 passengers became ill with norovirus. at about the same time 260 of the
Implement your model on a spreadsheet and find the optimal solution using Solver.
Significant increase in the mortality of lung cancer in both genders, but no significant effect was observed at lower levels." Is this an observational study or an experiment? Fully explain your reasoning.
What formula would I use? Can you break it down into baby steps so I can understand how you got the answer?
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