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Assume that we have normally distributed data. From the standard normal table, find the probability area bounded by ±1 standard deviation units about a population mean and by ±1 standard errors about the mean for any distribution of sample means of a fixed size. How do the areas compare?
their average cost was 340.00 with standard deviation of 80.00. Dean of students thinks that costs are greater this semester. Determine the test value for this hypothesis.
For a sample of 138 independent observations from a normal distribution of unknown μ and variance σ 2 = 2.6, the sample mean is 52.3. What is the width of the 95% confidence interval for μ?
A pharmaceutical company is testing the effectiveness of a new drug for lowering cholesterol. As part of this trial they wish to determine whether there is a difference between the effectiveness for women and for men. At a=5, what is the test valu..
Your poster should highlight the problem and its motivation, your approach and principal contributions, the results of your experiments, and any major take-aways for the future - development of your statistical analysis, including a mathematical f..
Find the percentage of such males that weigh between 190 and 210 lb. (Note: Make sure you choose the flag value closest to 190 and 210.) Give the proportion as a decimal rounded to thousandths.
determine if the following data set is a population or a sample the average electric bill for the 50 united states and
A random sample of 25 injections resulted in a variance of 0.135 test if the apparatus has a greater variance than the desired one.
To find the 95 percent confidence interval for the true population mean. From the results below, is it true that 95% of the sample means will fall
A certain type of tomato seed germinates 90% of the time. A backyard farmer planted 25 seeds. What is the probability that exactly 20 germinate?
is there a relationship between x rate of poverty measured as percent of population below poverty level and y rates of
there are 40 students in an elementary statistics class. on the basis of years of experience the instructor knows that
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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