Please help! A researcher wants to test whether listening to classical music before bed has an effect on a
college student's sleep quality. Identify a potential problem, if any, with each experimental
design. Then describe how you can improve it.

Sixty college students volunteer to listen to classical music every night before bed for one month. Sixty
other college students volunteer to not listen to any music before bed for one month. Each person is
evaluated and it is determined that the college students who listened to classical music had improved
sleep quality

Lems1. the following data set represents the scores on intelligence quotient(iq) examinations of 40 sixth-grade students at a particular school: 114, 122, 103, 118, 99, 105, 134, 125, 117, 106, 109, 104, 111, 127,133, 111, 117, 103, 120, 98, 100, 130, 141, 119, 128, 106, 109, 115,113, 121, 100, 130, 125, 117, 119, 113, 104, 108, 110, 102(a) present this data set in a frequency histogram.(b) which class interval contains the greatest number of data values? (c) is there a roughly equal number of data in each class interval? (d) does the histogram appear to be approximately symmetric? if so,about which interval is it approximately symmetric?

Afamily has five members. a mom, a dad, two sisters, & a brother. the family lines up single file. what is the probabillity that the mom is at the front of the line

Find │–14│ a. 14 b. –14 c. start fraction 1 over 14 end fraction