Question

Annual profit was measured for a group of electrical equipment companies and a group of food and drug stores. The following data was calculated: Elec companies: x1= 5.6, s1= 1.0, n1= 15 Food & drug stores: x2= 2.5, s2= 0.9, n2= 12 Assume the populations are normal and have equal standard deviations. Find a 99% confidence interval for the difference between the mean profits of the two types of companies Please show work if possible!!!! The answers are (2.07,4.13) sp=.9573 df=25, i just dont know how to get them.

Answer #1

Annual profit was measured for a group of electrical equipment companies and a group of food and drug stores. The following data was calculated: Elec companies: x1= 5.6, s1= 1.0, n1= 15 Food & drug stores: x2= 2.5, s2= 0.9, n2= 12 Assume the populations are normal and have equal standard deviations. Find a 99% confidence interval for the difference between the mean profits of the two types of companies

Please show work if possible!!!!

The answers are (2.07,4.13) sp=.9573 df=25, i just dont know how to get them.

1. The following data represent petal lengths (in cm) for
independent random samples of two species of Iris.
Petal length (in cm) of Iris virginica:
x1; n1 = 35
5.1
5.9
6.1
6.1
5.1
5.5
5.3
5.5
6.9
5.0
4.9
6.0
4.8
6.1
5.6
5.1
5.6
4.8
5.4
5.1
5.1
5.9
5.2
5.7
5.4
4.5
6.4
5.3
5.5
6.7
5.7
4.9
4.8
5.9
5.1
Petal length (in cm) of Iris setosa:
x2; n2 = 38
1.5
1.9
1.4
1.5
1.5...

The following data represent petal lengths (in cm) for
independent random samples of two species of Iris.
Petal length (in cm) of Iris virginica: x1; n1
= 35
5.1 5.5 6.2 6.1 5.1 5.5 5.3 5.5 6.9 5.0 4.9 6.0 4.8 6.1 5.6 5.1 5.6
4.8 5.4 5.1 5.1 5.9 5.2 5.7 5.4 4.5 6.4 5.3 5.5 6.7 5.7 4.9 4.8 5.8
5.1
Petal length (in cm) of Iris setosa: x2; n2
= 38
1.4 1.6 1.4 1.5 1.5 1.6...

The following data represent petal lengths (in cm) for
independent random samples of two species of Iris. Petal length (in
cm) of Iris virginica: x1; n1 = 35 5.0 5.7 6.2 6.1 5.1 5.5 5.3 5.5
6.9 5.0 4.9 6.0 4.8 6.1 5.6 5.1 5.6 4.8 5.4 5.1 5.1 5.9 5.2 5.7 5.4
4.5 6.4 5.3 5.5 6.7 5.7 4.9 4.8 5.8 5.2 Petal length (in cm) of
Iris setosa: x2; n2 = 38 1.6 1.6 1.4 1.5 1.5 1.6...

The following data represent petal lengths (in cm) for
independent random samples of two species of Iris.
Petal length (in cm) of Iris virginica:
x1; n1 = 35
5.3
5.9
6.5
6.1
5.1
5.5
5.3
5.5
6.9
5.0
4.9
6.0
4.8
6.1
5.6
5.1
5.6
4.8
5.4
5.1
5.1
5.9
5.2
5.7
5.4
4.5
6.4
5.3
5.5
6.7
5.7
4.9
4.8
5.7
5.2
Petal length (in cm) of Iris setosa:
x2; n2 = 38
1.6
1.9
1.4
1.5
1.5
1.6...

Construct a
99%
confidence interval for
mu 1 minus mu 2μ1−μ2
with the sample statistics for mean cholesterol content of a
hamburger from two fast food chains and confidence interval
construction formula below. Assume the populations are
approximately normal with unequal variances.
Stats
x overbar 1 equals 134 mg comma s 1 equals 3.64 mg comma n 1
equals 20x1=134 mg, s1=3.64 mg, n1=20
x overbar 2 equals 88 mg comma s 2 equals 2.02 mg comma n 2
equals...

Q1: A random sample of 390 married couples found that 290 had
two or more personality preferences in common. In another random
sample of 570 married couples, it was found that only 36 had no
preferences in common. Let p1 be the population
proportion of all married couples who have two or more personality
preferences in common. Let p2 be the population
proportion of all married couples who have no personality
preferences in common.
(a) Find a 95% confidence interval...

1. A city official claims that the proportion of all commuters
who are in favor of an expanded public transportation system is
50%. A newspaper conducts a survey to determine whether this
proportion is different from 50%. Out of 225 randomly chosen
commuters, the survey finds that 90 of them reply yes when asked if
they support an expanded public transportation system. Test the
official’s claim at α = 0.05.
2. A survey of 225 randomly chosen commuters are asked...

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