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A random variable X follows a normal distribution with a mean of 10 and standard deviation of 3. A standardized value of X was found to be Z = 3. The value of X is then
A sample of 30 is selected and their ages are recorded as shown below. The standard deviation is 9. At ? = 0.05 is there enough evidence to reject the researcher's claim? Show all work.
The following table shows the distribution of blood types in the general population. What is the probability a person will have type O blood?
In a study conducted by UCLA, it was found that 30% of college freshmen support increased military spending. If 12 college freshmen are randomly selected, find the probability that more than 5 sele
If the mean plasma-aldosterone level in African American children what was them mean=230 pmol/L with standard deviation which is 203 pmol/L.
Find the probability that a sample of 900 voters would yield a sample proportion in favor of the candidate within 3 percentage points of the actual proportion.
Find the 90% confidence interval for the true difference in proportions for the data in problem above.
A student guesses at each question. Assuming the choices are all equally likely, what is the probability that the student gets all three correct?
A 98% confidence interval estimate for a population mean was computed to be (26.4, 47.8). Determine the mean of the sample, which was used to determine the interval estimate
Find the probability that the mean SAT score for a randomly selected group of 150 11th graders is between 508 and 492.
The average AIMS test scores for two different teachers in Cochise County were 473 (8 students) and 459 (18 students.) The respective deviations were 39.7 and 24.5. Can it be concluded that the ave
Consider a normal population with µ = 25 and ? = 7.0. Calculate the standard score for a value x of 27.
If ten people are picked at random, what is the prob that six will have no flats three will have one flat and one will have two flat tires in the next year?
You find that a random sample of 31 milk containers has a standard deviation of 0.53. Using "alpha" = 0.05, is there enough evidence to reject the Association's claim? Would your conclusion change i
Find the mean, variance, and standard deviation. Please show all of your work
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?