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A sporting goods producer claims that the variance of the strengths of a certain fishing line is 15.9. A random sample of 15 spools has a variance of 21.8. At "alpha" = 0.01, can the claim be prove
Construct both an ungrouped and a grouped frequency distribution for the data given below:
Suppose that two 4-sided dice are rolled (that is, each die has faces with numbers 1, 2, 3, & 4). What is the probability that the sum of the numbers appearing on the dice is equal to 7?
What distinguishes raw scores from difference scores besides the fact that difference scores are used in t-statistic for repeated-measures research design?
To test this hypothesis you ask a random sample of 200 graduates and 21% agree with that a degree is not worth the cost. At "alpha" = 0.10, is there enough evidence to reject the claim?
Suppose that the mean score on a creativity test is 20 and the standard deviation is 5. You are told that the distribution is normal. Using the approximations for normal curves, how many people wou
Construct a 90% confidence interval estimate of the percentage of all adults who have the belief. Write a statement interpreting the confidence interval.
Using the approximations for normal curves, what percentage of scores fall between the mean and one standard deviation below the mean?
At "alpha" = 0.05, is there enough evidence to conclude that, on average, these lakes are nonacidic?
What are the two critical values for a two-tailed test with a 0.01 level of significance when n is large and the population standard deviation is known?
What is the probability of randomly sampling a set of 5 people out of this population who have a man IQ of 120 or greater?
In a poll of 600 randomly selected subjects, 240 answered "yes" when asked if they planned to vote in a state election. Construct a 95% confidence interval estimate of the proportion of all who plan t
Test the null hypothesis that the population mean for Medicaid enrolled women is 25% with a population standard deviation of 8%
You, of course, distrust him (you feel that it is much lower) and find that a random sample of 14 similar cars has a mean of price of $19,850 with a standard deviation of $1084. Is there enough evid
What is your estimate of the total amount spent by Americans of age 50 and over on restaurants and carryout food?
Calculate the expectation values and the variances for the for the random variable Y=2X + 5 for each of the different RVs X in the problem below:
Change the number from 53 to 14 and recalculate the confidence interval. Using the results, describe the effect of an outlier or extreme value on the confidence interval.
Develop a 95% confidence interval estimate of the mean amount spent per day by a family of four visiting Niagara Falls.
Use the given data to find the minimum sample size required to estimate the population proportion. Margin of error: 0.044; confidence level: 95%; and unknown
Use the given information to find the minimum sample size required to estimate an unknown population mean, µ.
For full marks use the coded method and round your answer to 1 decimal place. a) Find the slope for the trend-line. b) What is the intercept of the trend-line.
Develop a 95% confidence interval for the mean price charged by discount brokers for a trade of 100 shares at $50 per share.
Use these data and test to see whether the mean number of parts produced is the same with each method. Use a .05.
If one ticket is drawn, what is the expected value of the game? If two tickets are drawn, what is the expected value of the game?
A sample survey of 54 discount brokers showed that the mean price charged for a trade of 100 shares. Using the sample data, what is the margin of error associated with a 95% confidence interval?