Question
In: Statistics and Probability
12. A major study of alternative welfare programs randomly assigned women on welfare to one of...
12. A major study of alternative welfare programs randomly assigned women on welfare to one of two programs, called “WIN” and “Options”. WIN was the existing program. The new Options program gave more incentives to work. An important question was how much more (on the average) women in Options earned than those in WIN. Here is data for earnings in dollars over a three-year period:
Program Number of Participants Average Earnings Standard Deviation
Options 1362 7638 289
WIN 1395 6595 247
Is there evidence at the 5% significance level that the Options participants earn significantly more (on average) than those in the WIN program?
Solutions
Expert Solution
since the size of the sample is large enough, we will use Z test for mean here
There is evidence at the 5% significance level that the Options participants earn significantly more (on average) than those in the WIN program
orchestra answered 1 year agoRelated Solutions
12 subjects in a study were randomly assigned into two equally sized groups. One group was...
12 subjects in a study were randomly assigned into two
equally sized groups. One group was shown a short video on how to
fold paper cranes. The other group was given an instruction booklet
on how to do so. They were then asked to make paper cranes for the
next hour. The number of paper cranes each subject made was
recorded and is listed in the table below. The researchers are
interested in whether there was a difference in the...
In a comparison of two different weight-loss programs, obese participants were randomly assigned to one of...
In a comparison of two different weight-loss programs, obese
participants were randomly assigned to one of two groups: (1) the
soy group, a low-calorie group that ate only soy-based proteins, or
(2) the traditional group, a low-calorie group that received 2/3 of
their protein from animal products and 1/3 from plant products. One
of the dependent measures collected was the amount of body fat loss
as a percentage of initial body weight.
Summary data from each group based on this...
In a comparison of two different weight-loss programs, obese participants were randomly assigned to one of...
In a comparison of two different weight-loss programs, obese
participants were randomly assigned to one of two groups: (1) the
soy group, a low-calorie group that ate only soy-based proteins, or
(2) the traditional group, a low-calorie group that received 2/3 of
their protein from animal products and 1/3 from plant products. One
of the dependent measures collected was the amount of body fat loss
as a percentage of initial body weight.
Summary data from each group based on this...
A clinical trial is run to compare weight loss programs and participants are randomly assigned to...
A clinical trial is run to compare weight loss programs and
participants are randomly assigned to one of the four comparison
programs and are counseled on the details of the assigned program.
Three popular weight loss programs were considered: the low calorie
diet, the low fat diet, and the low carbohydrate diet . For
comparison purposes, a fourth group is considered as a control
group. Participants in the fourth group are told that they are
participating in a study of...
1. A clinical trial is run to compare weight loss programs and participants are randomly assigned...
1. A clinical trial is run to compare weight loss programs and
participants are randomly assigned to one of the comparison
programs and are counseled on the details of the assigned program.
Participants follow the assigned program for 8 weeks. The outcome
of interest is weight loss, defined as the difference in weight
measured at the start of the study (baseline) and weight measured
at the end of the study (8 weeks), measured in pounds. Three
popular weight loss programs...
In a study, 272 moderately obese subjects were randomly assigned to one of three diets: low-fat,...
In a study, 272 moderately obese subjects were randomly
assigned to one of three diets: low-fat, restricted-calorie;
Mediterranean, restricted-calorie; or low-carbohydrate,
nonrestricted-calorie. The prediction was that subjects on a
low-carbohydrate diet would lose weight, on the average. After
two years, the mean weight loss was 5.5 kg for the 109 subjects in
the low-carbohydrate group with a standard deviation of 7.0 kg.
The technology output below shows results of a significance test
for testing
Upper H 0 : mu equals...
In a study, 272 moderately obese subjects were randomly assigned to one of three diets: low-fat,...
In a study, 272 moderately obese subjects were randomly
assigned to one of three diets: low-fat, restricted-calorie;
Mediterranean, restricted-calorie; or low-carbohydrate,
nonrestricted-calorie. The prediction was that subjects on a
low-carbohydrate diet would lose weight, on the average. After
two years, the mean weight loss was 5.5 kg for the 109 subjects in
the low-carbohydrate group with a standard deviation of 7.0 kg.
The technology output below shows results of a significance test
for testing
Upper H 0 : mu equals...
) In a study of the effects of caffeine on alertness, 32 subjects were randomly assigned...
) In a study of the effects of caffeine on alertness, 32
subjects were randomly assigned to four groups. These groups were
C1: wait-list control (no treatment), C2: placebo control, E1:
experimental group 1 (mild caffeine treatment) and E2: experimental
groups 2 (high caffeine treatment). Several subjects were not able
to complete the study, reducing the group n’s to 7, 5, 6, and 3,
respectively. The dependent variable scores were performance scores
on a visual-motor task requiring alertness. The results...
A hypertension trial is mounted and 12 participants are randomly assigned to receive either a new...
A hypertension trial is mounted and 12 participants are randomly
assigned to receive either a new treatment or a placebo. Each
participant takes the assigned medication and their systolic blood
pressure (SBP) is recorded after 6 months on the assigned
treatment. The data are as follows.
Placebo
New Treatment
134
114
143
117
148
121
142
124
150
122
160
128
Is there a difference in mean SBP between treatments?
Assume equal variances. Run the test at a 5% level...
1) In a study of the effects of caffeine on alertness, 32 subjects were randomly assigned...
1) In a study of the effects of caffeine on alertness, 32
subjects were randomly assigned to four groups. These groups were
C1: wait-list control (no treatment), C2: placebo control, E1:
experimental group 1 (mild caffeine treatment) and E2: experimental
groups 2 (high caffeine treatment). Several subjects were not able
to complete the study, reducing the group n’s to 7, 5, 6, and 3,
respectively. The dependent variable scores were performance scores
on a visual-motor task requiring alertness. The results...
ADVERTISEMENT
ADVERTISEMENT
Latest Questions
- Use the bond term's below to answer the question Maturity 7 years Coupon Rate 4% Face...
- What experience have you had with Organization Development or with Change Management? Describe the organization, the...
- 1. Renfro Rentals has issued bonds that have a 12% coupon rate, payable semiannually. The bonds...
- Given an array of positive integers a, your task is to calculate the sum of every...
- Define “culture.” Software is defined by the Merriam-Webster Dictionary as "the programs that run on a...
- In humans, hypotrichosis (sparse body hair) is a rare autosomal recessive condition. Let h = hypotrichosis...
- Increase all of the listing prices by 5% for all listings under $500,000 and 10% for...
ADVERTISEMENT