Already have an account? Get multiple benefits of using own account!
Login in your account..!
Remember me
Don't have an account? Create your account in less than a minutes,
Forgot password? how can I recover my password now!
Enter right registered email to receive password!
A local college requires an English composition course for all freshman. This year they are evaluating a new online version of the course. A random sample of n=16 freshman is selected and the students are placed in the online course. At the end of the semester, all freshman take the same English composition exam. The average score for the same is M=76. For the general population of freshman who took the traditional lecture class, the exam scores form a normal distribution with a mean of µ=80.
If the final exam scores for the population have a standard deviation of 12, does the sample provide enough evidence to conclude that the new online course is significantly different from the traditional class? Assume a two-tailed test with and alpha =.05.
If the population standard deviation is 6, is the sample sufficient to demonstrate a significant difference? Again, assume a two-tailed test with and alpha =.05.
Comparing your answers for parts a and b, explain how the magnitude of the standard deviation influences the outcome of a hypothesis test.
Give a possible description why serum cholesterol values for older males are lower than for younger males and reverse is true for females.
A normal distribution has a mean of µ = 70 with σ = 12. If one score is randomly selected from this distribution, what is the probability that the score will be less than X = 55?
What would be the correct null and alternative hypothesis for the following situation: The sample has a mean of 72.3 mph and a standard deviation of 7.4 mph. Use a 0.05 significance level to test the claim that the mean speed of all cars is greate..
Dan Thompson, the president of CEO Airlines, recently noted an increase in the number of no-shows for flights out of Atlanta.
Construct a 95 percent confidence interval for the population mean. Is it reasonable that the population mean is 28 weeks? Justify your answer.
Construct a 90% confidence interval for the true mean weight. What sample size would be necessary to estimate the true weight with an error of plus or minus .03 grams with a 90% confidence?
An urn contains 8 balls identical in every respect except color. There are 4 blue balls, 3 red balls, and 1 white ball.
We suspect that automobile insurance premiums (in dollars) may be steadily decreasing with the driver's driving experience (in years), so we choose a random sample of drivers who have similar automobile insurance coverage and collect data about th..
Suppose that students in a particular school are all very competent. For each individual, the probability that they will pass the proficiency exam (independent of thier classmates) is 0.99
Choose one of the options below that explains what information is provided in the interval that is not in the significance test results:
Best Electronics, Inc. offers a "no hassle" returns policy. The number of items returned per day follows the normal distribution. The mean number of customer returns is 10.4 per day and the standard deviation is 2.3 per day.
On the same chart, produce a graph showing the original probability mass function, and a line graph showing your selected continuous probability density function.
Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!
whatsapp: +1-415-670-9521
Phone: +1-415-670-9521
Email: [email protected]
All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd