Two proposed computer mouse designs were compared by recording wrist extension in degrees for 24 people who each used both mouse types (comparative study of two computer mouse designs," cornell human factors laboratory technical report rp7992). the difference in wrist extension was computed by subtracting extension for mouse type b from the wrist extension for mouse type a for each student. the mean difference was reported to be 8.82 degrees. assume that it is reasonable to regard this sample of 24 people as representative of the population of computer users. a. suppose that the standard deviation of the differences was 10 degrees. is there convincing evidence that the mean wrist extension for mouse type a is greater than for mouse type b? use a .05 significance level. b. suppose that the standard deviation of the differences was 26 degrees. is there convincing evidence that the mean wrist extension for mouse type a is greater than for mouse type b? use a .05 significance level. c. briefly explain why a different conclusion was reached in the hypothesis tests of parts (a) and (b).

the square root of what number? if you add that, then someone will probably answer the question.

2. angles qrt and qst both measures 156 degrees.

step-by-step explanation:  

we have been given a diagram of a circle and we are told that measure of arc qvt is 156 degrees.  

we can see from our given diagram that angle qrt and angle qst subtends to arc qvt.

since we know that angles subtended by the same arc at the circumference are always equal.

by angle subtended by same arc theorem, measure of angle qrt and angle qst will be equal to the measure of arc qvt.

therefore, angles qrt and qst both measures 156 degrees and 2nd statement is the correct choice.

if gloria has "carry over" minutes, (that is, any minutes paid for but not used in a month can be applied to her payment for minutes in the next month,) her total usage for the three months is: total minutes = 320 + 243 + 489 = 1052 minutes number of 200 minute blocks = 1052/200 = 5 r52 (that is 5 with a remainder of 52) rounding up the number of 200 minute blocks gives her usage for the three months as 6 blocks. the cost for six blocks is 6 x $25 = $150 she also has 200 - 52 or 148 carry over minutes if gloria pays each month and unused minutes are lost, applying the rounding up procedure to each month gives: first month usage of 320 minutes rounds up to 2 blocks of 200 minutes for a payment of 2 x $25 = $50 second month usage of 243 minutes rounds up to 2 blocks of 200 minutes for a payment of 2 x $25 = $50 third month usage of 489 minutes rounds up to 3 blocks of 200 minutes for a payment of 3 x $25 = $75 total payments for the three months are $50 + $50 + $75 = $175 get the plan with carry over minutes!