Twenty students randomly assigned to an experimental group

Reference no: EM13241159

Twenty students randomly assigned to an experimental group receive an instructional program; 30 in a second group do not. After 6 months, both groups are tested on their knowledge. The experimental group has a mean of 38 on the test (with an estimated population standard deviation of 3); the control group has a mean of 35 (with an estimated population standard deviation of 5). Using the .05 level, what should the experimenter conclude? (a)Use the steps of hypothesis testing, (b) sketch the distributions involved, and (c) explain your answer to someone who is familiar with the t test for a single sample, but not with the t test for independent means.

Reference no: EM13241159

Questions Cloud

Does geography or territory-alone define arabness : Does ‘geography’, or territory, alone define ‘Arabness’? Is ‘Arab’ an ‘ethnos’? What is ‘ethnos’? How does remapping of the ‘Arab World’ necessitate re-writing of its history? What is the role of the Arabic language and Islam in shaping this ‘re-writ..

What is the probability to find in both neighborhoods : A real estate agent has 2 tours. The first tour through N1and has 10 homes for sale, whereas the second tour through N2and has 5 homes for sale.

A semiannual interest rate swap contract : On 3/5/2012, you entered into a semiannual interest rate swap contract,

A recent article in a computer magazine suggested that the : A recent article in a computer magazine suggested that the mean time to fully learn a new software program is 40 hours. A sample of 100 first-time users of a new statistics program revealed the mean time to learn it was 39 hours with the standard dev..

Twenty students randomly assigned to an experimental group : Twenty students randomly assigned to an experimental group receive an instructional program; 30 in a second group do not. After 6 months, both groups are tested on their knowledge

Explain how rapid modernization can affect people of nation : From your own readings, study, and personal experience, explain how rapid modernization can affect the people of an emerging nation, both for good and for ill. Support your postings with information drawn from a number of sources.

You take a random sample of pizzas sold during a one hour : You take a random sample of pizzas sold during a one hour period over the next week. Group 1 and Group 2 The results are shown in the table to the at the bottom of this. Does the ad campaign make a difference? Can you suggest a different methodology ..

A catering company is buying equipment in order to set up : A manufacturer produces a batch of memory chips (RAM) and measures the mean-time-between-failures (MTBF). The manufacturer then changes a manufacturing process and produces another batch and again measures the MTBF

Written in opposition to slavery : Both Frederick Douglass' autobiographical Narrative and Mark Twain's fictional Adventures of Huckleberry Finn were written in opposition to slavery. Compare thr passages of these two male authors and describe any similarities and/or differences you s..

User Account

All Pages