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Find the probability for Normal distribution.
ACT scores of high school seniors. The scores of high school seniors on the ACT college entrance examination in 2003 had mean JL = 20.80 and standard deviation (J = 4.80. The distribution of scores is only roughly Normal.
(a) What is the approximate probability that a single student randomly chosen from all those taking the test scores 23 or higher?
(b) Now take an SRS of 25 students who took the test. What are the mean and standard deviation of the sample mean score x of these 25 students?
(c) What is the estimated probability that the mean score x of these students is 23 or higher?
(d) Which of the two Normal probability calculations in (a) and (c) is more accurate and Why?
The critical value of F at 95% confidence when there is a sample size of 21 for the sample with the smaller variance, and there is a sample size of 9 for the sample with the larger sample variance is:
Find the probability that a randomly selected employee earns less than $5.43.
What is the probability that there will be more than three trucks either being loaded or waiting?
Use the method of least squares to model the relationship between x and y.
When the non-parametric statistics utilized? Write down an example.
A sample of 40 decaffeinated-coffee drinkers showed a mean of 5.84 cups per day, with a standard deviation of 1.36 cups per day. Use the .01 significance level. Compute the p-value.
At the 0.05 level of significance, is there evidence of a significant relationship between the age groups and where people primarily get their news? If so explain the relationship.
Your statistics instructor wants you to determine a confidence interval estimate for the mean test score for the next exam.
The ________ is the probability of observing a sample value as extreme as, or more extreme than the value observed, given that the null hypothesis is true.
In exercise identify (a) sample and (b) population. Also, find whether sample is likely to be representative of population.
Assuming we can verify that the data set is approximately normally distributed, what percentage of times will the server be down less than 24 minutes?
Verify that this is valid density function. Find out probability that weight is smaller than 24 ounces.
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