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!
An e-commerce business wishes to estimate the proportion of its web site users who entered false phone numbers when registering. A sample of 250 users is chosen at random. Of these, 37 are discarded because of database errors. Of the remaining users, 19 had registered with false phone numbers.
(a) Find a 99% confidence interval for the proportion of registered users with false phone numbers and explain what it indicates. Use language that a manager could easily understand.
(b) The manager wants the margin of error to be 2% or less. How large a sample should be taken?
(c) The manager decided that a margin of error of 3% will be sufficient. How large a sample must be taken now?
(d) The business is interested in trying to redesign its web site to cut down on the number of registrations with false phone numbers. How large a sample of registrations would be needed if they wanted to test their success using a = 0.1 and wanted to be able to detect a decrease from 10 to 5% with probability 0.8?
is the value t 2.12 statistically significant at the 10 level? at the 5 level?a. the value t 2.12 is significant both
the manager of a computer software company wishes to study the number of hours junior executives by type of industry
Analysis of Variance
Test out an suitable hypothesis also state your conclusion. Make sure the suitable assumption as well as conditions are satisfied before you proceed.
At the conclusion of the instructional period, a reading test gave results y1 = 74, y2 = 71, s1 = 9, and s2 = 10. What is the attained signi?cance level if you wish to see if there is evidence of a real difference between the two population means?..
born between 1980 and 1990 generation next have lived in a post-cold war world and a time of relative economic
suppose that a category of world class runners are known to run a marathon 26 miles in an average of 145 minutes with a
Use Benford's distribution to calculate the probability of each digit and record your results in the table above. Comment on how closely your distribution of first digits follows Benford's distribution. Why are they not exactly the same?
in the new dunn zone at waldo stadium the university has decided to run a promotion to increase student attendance. for
What is the Central Limit Theorem? How large should the sample size be if the underlying distribution of the population values are:
What is the appropriate inferential statistical test for the case scenario? Why?
A random sample of 58 fish is taken from the tank. Let x be the mean sample length of these fish. What is the probability that x is within 0.5 inch of the claimed population mean? (Round your answer to four decimal places.)
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