Question

An article reports an investigation into the toxicity of bilirubin on several cell lines. Ten sets of human liver cells and 25 sets of mouse fibroblast cells were placed into solutions of bilirubin in albumin with a 1.4 bilirubin/albumin molar ratio for 24 hours. In the 10 sets of human liver cells, the average percentage of cells surviving was 53.9 with a standard deviation of 10.7. In the 25 sets of mouse fibroblast cells, the average percentage of cells surviving was 73.1 with a standard deviation of 9.1. Let μXμX represent the population mean for the mouse cells and let μYμY represent the population mean for the human cells. Find a 98% confidence interval for the difference μX−μYμX−μY . Round down the degrees of freedom to the nearest integer and round the answers to three decimal places.

The 98% confidence interval is ( , ).

Answer #1

An article reports that the average initial rate of absorption
(in g/min·cm2) for a sample of five clay bricks with
fine glass particles added was 1299.8 with a standard deviation of
329.8, and the average for another sample of fifteen bricks without
glass particles added was 4500.8 with a standard deviation of
271.6. Let μXμX represent the population mean without glass
particles and let μYμY represent the population mean with glass
particles. Find a 98% confidence interval for the difference...

An article reports that the average initial rate of absorption
(in g/min·cm2) for a sample of five clay bricks with
fine glass particles added was 1299.8 with a standard deviation of
329.8, and the average for another sample of fifteen bricks without
glass particles added was 4500.8 with a standard deviation of
271.6. Let μXμX represent the population mean without glass
particles and let μYμY represent the population mean with glass
particles. Find a 98% confidence interval for the difference...

Three specimens of untreated wastewater produced at a gas field
had an average benzene concentration of 6.83 mg/L with a standard
deviation of 1.72 mg/L. Seven specimens of treated waste water had
an average benzene concentration of 3.32 mg/L with a standard
deviation of 1.17 mg/L. Let μXμX represent the population mean for
untreated wastewater and let μYμY represent the population mean for
treated wastewater. Find a 95% confidence interval for the
difference μX−μYμX−μY . Round down the degrees of...

A sample of 10 diesel trucks were run both hot and cold to
estimate the difference in fuel economy. The results, in mpg, are
presented in the following table.
Truck
Hot
Cold
1
4.55
4.26
2
4.46
4.08
3
6.49
5.83
4
5.37
4.96
5
6.25
5.87
6
5.90
5.32
7
4.12
3.92
8
3.85
3.69
9
4.15
3.74
10
4.69
4.19
Let μXμX represent the population mean for hot engines and let
μYμY represent the population mean for cold engines....

An article reports that the average initial rate of absorption
(in g/min·cm2) for a sample of five clay bricks with fine glass
particles added was 1299.8 with a standard deviation of 329.8, and
the average for another sample of fifteen bricks without glass
particles added was 4500.8 with a standard deviation of 271.6. Let
μX represent the population mean without glass particles and let μY
represent the population mean with glass particles. Find a 98%
confidence interval for the difference...

A tire manufacturer is interested in testing the fuel economy
for two different tread patterns. Tires of each tread type are
driven for 1000 miles on each of 18 different cars. In a separate
experiment, 18 cars were outfitted with tires with tread type A,
and another 18 were outfitted with tires with tread type B. Each
car was driven 1000 miles. The cars with tread type A averaged
23.94 mpg, with a standard deviation of 1.79 mpg. The cars...

A computer system administrator notices that computers running a
particular operating system seem to freeze up more often as the
installation of the operating system ages. She measures the time
(in minutes) before freeze-up for seven computers one month after
installation, and for nine computers seven months after
installation. The results are as follows:
One month after install: 207.4
233.1 215.9
235.1 225.6
244.4 245.3
Seven months after install: 84.3 53.2
127.3 201.3
174.2 246.2
149.4 156.4
104.3
Let μXμX...

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