Question
In: Statistics and Probability
Researchers wanted to compare the effectiveness of a water softener used with a filtering process with...
Researchers wanted to compare the effectiveness of a water softener used with a filtering process with a water softener used without filtering. Ninety locations were randomly divided into two groups of equal size. Group A locations used a water softener and the filtering process, while group B used only the water softener. At the end of three months, a water sample was tested at each location for its level of softness. (Water softness was measured on a scale of 1 to 5, with 5 being the softest water.) The results were as follows.
group A
x1 = 2.1
s1 = 0.7
group B
x2 = 1.7
s2 = 0.4
Determine, at the 90% confidence level, whether there is a difference between the two types of treatments.
Solutions
orchestra answered 2 years agoRelated Solutions
A team of researchers wanted to assess the effectiveness of the 4 components of a weight...
A team of researchers wanted to assess the effectiveness of the
4 components of a weight loss program by comparing the distribution
of weight status across 4 different treatment groups. The data is
summarized in the table below:
Weight Status
Intervention Component
Normal Weight
Overweight
Obese
Control Group (n=100)
50
35
15
Calorie Counting (n=100)
70
20
10
Physical Activity (n=100)
73
15
12
Combination (n=100)
80
15
5
Is there a difference in weight status by intervention
component? (Hint:...
A team of researchers wanted to assess the effectiveness of the 4 components of a weight...
A team of researchers wanted to assess the effectiveness of the
4 components of a weight loss program by comparing the distribution
of weight status across 4 different treatment groups. The data is
summarized in the table below:
Weight Status
Intervention Component
Normal Weight
Overweight
Obese
Control Group (n=100)
50
35
15
Calorie Counting (n=100)
70
20
10
Physical Activity (n=100)
73
15
12
Combination (n=100)
80
15
5
Is there a difference in weight status by intervention
component? (Hint:...
A team of researchers wanted to assess the effectiveness of the 4 components of a weight...
A team of researchers wanted to assess the effectiveness of the
4 components of a weight loss program by comparing the distribution
of weight status across 4 different treatment groups. The data is
summarized in the table below:
Intervention Component: Normal weight / Overweight / Obese
Control Group(n=100) 50 35 15
Calorie Counting(n=100) 70 20 10
Physical Activity(n=100) 73 15 12
Combination(n=100) 80 15 5
Is there a difference in weight status by intervention
component? (Hint: Are intervention component and...
A team of researchers wanted to assess the effectiveness of the 4 components of a weight...
A team of researchers wanted to assess the effectiveness of the
4 components of a weight loss program by comparing the distribution
of weight status across 4 different treatment groups. The data is
summarized in the table below:
Weight Status
Intervention Component
Normal Weight
Overweight
Obese
Control Group (n=100)
50
35
15
Calorie Counting (n=100)
70
20
10
Physical Activity (n=100)
73
15
12
Combination (n=100)
80
15
5
Is there a difference in weight status by intervention
component? (Hint:...
A team of researchers wanted to assess the effectiveness of the 4 components of a weight...
A team of researchers wanted to assess the effectiveness of the
4 components of a weight loss program by comparing the distribution
of weight status across 4 different treatment groups. The data is
summarized in the table below:
Intervention Component: Normal weight / Overweight / Obese
Control Group(n=100) 50 35 15
Calorie Counting(n=100) 70 20 10
Physical Activity(n=100) 73 15 12
Combination(n=100) 80 15 5
Is there a difference in weight status by intervention
component? (Hint: Are intervention component and...
Researchers wanted to compare the GRE scores of the students who were trained in an academy...
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mean score of 315. Another group of 120students, who had no
training, had a mean score of 305. Assume the population standard
deviations for the scores for the students who take the training
and the students who don't take the training are 25 and 20,...
Researchers wanted to compare the proportion of females who are left-handed to the proportion of males...
Researchers wanted to compare the proportion of females who are
left-handed to the proportion of males who are left-handed. The
researchers randomly selected 815 females and 575 males. They
observed that 66 of the females and 60 of the males were
left-handed.
Test the claim that the proportion of females who are
left-handed is lower than the proportion of males who are
left-handed. Test the claim at the 5% significance level.
Credit will be given for a complete analysis that...
Researchers wanted to compare the proportion of females who are left-handed to the proportion of males...
Researchers wanted to compare the proportion of females who are
left-handed to the proportion of males who are left-handed. The
researchers randomly selected 815 females and 575 males. They
observed that 66 of the females and 60 of the males were
left-handed. Test the claim that the proportion of females who are
left-handed is lower than the proportion of males who are
left-handed. Test the claim at the 5% significance level.
Describe briefly the mode of action of zeolite count water softener
Describe briefly the mode of action of zeolite count water
softener
Can precipitation using a water softener determine water hardness? Demonstrate with a sample calculation using 15...
Can precipitation using a water softener determine water
hardness? Demonstrate with a sample calculation using 15 mL of hard
water and .101g of postassium carbonate as a softener.
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