shown below are among the results obtained in the study. Higher scores correspond to greater pain levels. Assume that the two samples are independent simple random samples selected from normally distributed populations, and do not assume that the population standard deviations are equal. Complete parts (a) to (c) below. Reduction in Pain Level After Magnet Treatment (4,): n= 20, x = 0.55, s = 0.91 Reduction in Pain Level After Sham Treatment (ua): n= 20, x= 0.46, s = 1.31 a. Use a 0.05 significance level to test the claim that those treated with magnets have a greater mean reduction in pain than those given a sham treatment (similar to a placebo). What are the null and alternative hypotheses? VA. Ho: H1= P2 O B. Ho: H1 = H2 H1: H1> H2 O C. Ho: H1

Q11

A researcher found that the two groups (n=25 in each group) they tested were significantly different from each other with a t-value of 2.91, which has a corresponding p-value of p=.06. Report the findings in APA number format.

Athletes performing in bright sunlight often smear black eye grease under their eyes to reduce glare. Does eye grease work? In one study, 16 student subjects took a test of sensitivity to contrast after three hours facing into bright sun, both with and without eye grease. (Greater sensitivity to contrast improves vision, and glare reduces sensitivity to contrast.) This is a matched pairs design. The differences in sensitivity, with eye grease minus without eye grease, are given in the table. 0.07 0.64 −0.12 −0.05 −0.18 0.14 −0.16 0.03 0.05 0.02 0.43 0.24 −0.11 0.28 0.05 0.29 Click to download the data in your preferred format.    CSV    Excel    JMP    Mac-Text    Minitab14-18    Minitab18+   PC-Text    R    SPSS    TI   CrunchIt! How much more sensitive to contrast are athletes with eye grease than without eye grease? Give a 95% confidence interval to answer this question. Give your answers to four decimal places. lower bound:     upper bound: