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A dump of our free Chat sessions, in case it is useful. It excludes white boards used during paid sessions.

tutor3 : Hello Student, May I help you with your Math problems?
student : hi yes please
student : Kathleen Vohs of the University of Minnesota and her coworkers carried out several randomized comparative experiments on the effects of thinking about money. Here’s part of one such experiment. Ask student subject to unscramble 30 sets of five words to make a meaningful phrase from four of the five words. The control group unscrambled phrases like “cold it desk outside is” into “it is cold outside.” The treatment group unscrambled phrases that lead to thinking about money, turning “high salary desk paying” into “a high-paying salary.” Then each subject worked a hard puzzle, knowing that they could ask for help. Here are the times in seconds until subjects asked for help:
Treatment group:
609 444 242 198 174 55 251 466 443
531 135 241 476 482 362 69 160
Control group:
118 272 412 290 140 104 55 189 126
400 91 63 87 142 141 373 156
The researcher suspected that money is connected with self-sufficiency, so that the treatment group would ask for help less quickly on the average. Do the data support this idea? Use a 5% level of significance.
student : can you help me with this?
tutor3 : here you perform a paired t test. take one variable as z and other as y
tutor3 : sorry first variable as x. then cal z=x-y
student : i dont quite understand the z=x-y
tutor3 : then calculate mean(z) and sd(z) here n=17
student : it wants me to go through this process i think:
student : Your work for all statistical hypothesis testing questions should include the following:
1. Established Ho and Ha.
2. Summary statistics (either computed or given in the problem)
3. The name of the test (e.g. 2sampleTtest or T-test about correlation, etc.)
4. A formula to compute a test statistic (e.g. 1Prop-Z test statistic, etc.)
5. A p-value of the test and/or a critical value from a statistical table.
6. Clearly state the decision rule you use the reach a conclusion. (You may have to sketch a graph to show rejection regions.) Do you “Reject Ho” or do you “Fail to Reject Ho”?
7. State your conclusion in plain language. Use complete sentences.
tutor3 : for example take the first observations of x and y so z= 609-118=491
tutor3 : You can fax your homework to 206-339-8302 or, email to *****@aafter.com
You can also take a photo of your homework problems with any digital camera
or mobile phone and email us to *****@aafter.com
Please include your email and phone number.
student : did you want it in another format?
student : so Ho is Ho: p= 0.5 and Ha: p?
tutor3 : Here Ho= meanx-meany=0 ag h1= not equa to xero.. we have to test for 5% level of significance

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