Question

In a random sample of 340 cars driven at low altitudes, 46 of them exceeded a standard of 10 grams of particulate pollution per gallon of fuel consumed. In an independent random sample of 85 cars driven at high altitudes, 21 of them exceeded the standard. Can you conclude that the proportion of high altitude vehicles exceeding the standard is greater than the proportion of low altitude vehicles exceeding the standard?

Answer #1

Pollution and altitude: In a random sample of
320 cars driven at low altitudes, 50 of them exceeded a standard of
10 grams of particulate pollution per gallon of fuel consumed. In
an independent random sample of 135 cars driven at high altitudes,
17 of them exceeded the standard. Can you conclude that the
proportion of high-altitude vehicles exceeding the standard is less
than the proportion of low-altitude vehicles exceeding the
standard? Let p1 denote the proportion of low-altitude vehicles...

21)____________ A washing machine
manufacturer says that 85% of its washers last five
years
before
repairs are necessary. A random sample of 100 washers showed that
79 of
22)____________ them lasted five years
before they needed repair. Test to see if there is
a
difference between the manufacturer claim and the sample results.
List the
23)____________ 21) test
statistic 22)
p-value 23) Does this data indicate that
the
manufacturer’s claim is too high or too low? (yes...

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