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The College Boards are administered each year to thousands of high school seniors, and these scores are approximately normally distributed with a mean of 500, and a standard deviation of 100. Suppose a random sample of 100 students was drawn and the mean exam score was 545 with standard deviation of 49. Is the 45 point difference between the sample and the population merely due to chance? Use the appropriate two-tailed test with an α = 0.05.
Discuss why the standard error for the distribution of sample means is smaller than the standard deviation of sample scores. Distinguish between within-group designs and between-group designs.
Conduct a one-sided hypothesis test of the claim that corner-lot houses have higher average selling prices than those located on non-corner lots.
Probability using normal distribution.Sampling distributions. Given a normal distribution with μ = 50 and standard deviation σ = 9, if a sample of n = 100 is selected.
Suppose {a_n} (n=1 to N) and {b_n} (n=1 to N) are two finite sequences of complex numbers. Let B_k = sum b_n (sum n=1 to k) denote the partial sum of the series sum (b_n) with the convention B_0=0.
Determine the critical value. Using the critical value rejection rule, what is the statistical conclusion?
With the test statistic you chose, work out the problem with solution using .05 level of significance if it applies.
A sample of 15 workers reveal the following minutes: 29, 38, 38, 33, 38, 21, 45, 34, 40, 37, 42, 30, 29, 35. Develop 98% confidence interval for the population mean. Interpret your result.
Human populations can be modeled using an exponential growth function. Use the Library for research or other resources to find the following:
What is your initial perception of this information? What are other ways, beyond looking at the p-value alone, you could use to try to interpret what this outcome of r(2398) = -.21 tells us about the relationship between length of time taking drug..
At the 10% level of significance, is there sufficient evidence to indicate that more books are being loaned out per day, on the average?
The monthly utility bills are normally distributed with a mean value of $130 and a standard deviation of $15.
I am writing a thesis and need a paired difference statistical analysis with a confidence level at 95% with t-value for alpha of 0.25
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