Mathematics, 10.03.2020 04:06 dhcuajbfrhcyx
An experiment will be conducted to test the effectiveness of a weight-loss supplement. Volunteers will be randomly assigned to take either the supplement or a placebo for 90 days, with 12 volunteers in each group. The subjects will not know which treatment they receive. At the end of the experiment, researchers plan to calculate the mean weight loss for each of the two groups and to construct a two-sample t-confidence interval for the difference of the two treatment means. Which of the following assumptions is necessary for the confidence interval to be valid?
a. The sample size is greater than or equal to 10 percent of the population size.
b. Each of the two groups has at least 5 successes and at least 5 failures.
c. The distributions of weight loss of the two treatments are approximately normally distributed.
d. The volunteers in the supplement group are paired with volunteers in the placebo group.
e. The expected number of people who lose weight in each group is at least 5.
Answers: 1
Mathematics, 21.06.2019 15:10
Aline parallel to a triangle's side splits ab into lengths of x - 5 and x + 2. the other side, ac, is split into lengths of x and x + 12. what is the length of ac? a) 12 b) 24 c) 36 d)
Answers: 1
Mathematics, 21.06.2019 17:50
Segment ab is shown on the graph. which shows how to find the x-coordinate of the point that will divide ab into a 2: 3 ratio using the formula
Answers: 2
Mathematics, 21.06.2019 23:00
Each of the following data sets has a mean of x = 10. (i) 8 9 10 11 12 (ii) 7 9 10 11 13 (iii) 7 8 10 12 13 (a) without doing any computations, order the data sets according to increasing value of standard deviations. (i), (iii), (ii) (ii), (i), (iii) (iii), (i), (ii) (iii), (ii), (i) (i), (ii), (iii) (ii), (iii), (i) (b) why do you expect the difference in standard deviations between data sets (i) and (ii) to be greater than the difference in standard deviations between data sets (ii) and (iii)? hint: consider how much the data in the respective sets differ from the mean. the data change between data sets (i) and (ii) increased the squared difference îł(x - x)2 by more than data sets (ii) and (iii). the data change between data sets (ii) and (iii) increased the squared difference îł(x - x)2 by more than data sets (i) and (ii). the data change between data sets (i) and (ii) decreased the squared difference îł(x - x)2 by more than data sets (ii) and (iii). none of the above
Answers: 2
Mathematics, 21.06.2019 23:30
Tim earns $120 plus $30 for each lawn he mows.write an iniqualityvto represent how many lawns he needs to mow to make more than $310
Answers: 2
An experiment will be conducted to test the effectiveness of a weight-loss supplement. Volunteers wi...
Mathematics, 01.12.2021 03:00
Health, 01.12.2021 03:00
Mathematics, 01.12.2021 03:00
Health, 01.12.2021 03:00
Biology, 01.12.2021 03:00