Question

you are deciding between two different brands of tires and discover that brand a tires have a mean lifetime of 60000 miles with a standard deviation of 2500 miles brand bs tires have a mean lifetime of 60000 miles with a standard deviation of 10000 miles which brand would you choose and why

Answer #1

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Tires: a tire manufacturer believes that the tredlife of its
snow tires can be described by a normal model with a mean of 32,000
miles and standard deviation of 2500 miles
a. if you buy one of these tires, would it be reasonable for you
to hope it will last 40,000 miles and why?
b. aprox. what fraction of these tires can be expected to last
less than 30,000 miles
c. aprox what fraction of these tires can be expected...

You measure the lifetime of a random sample of 64 tires of a
certain brand. The sample mean is ?¯=50 months. Suppose that the
lifetimes for tires of this brand follow a Normal distribution,
with unknown mean ? and standard deviation ?=5 months, then a 99%
confidence interval for ? is: A) 48.78 to 51.22. B) 49.8 to 50.2.
C) 40.2 to 59.8. D) 48.39 to 51.61.

A lifetime of certain brand of tires is normally distributed
with the mean of 80, 000 kilometers and a standard deviation of
6000 kilometers. a. Probability that a randomly selected tire will
have lifetime 70,000 kilometers or more is __________ b. The
percent of tires with lifetimes between 65, 000 kilometers and 85,
000 kilometers is ______________ c. The manufacturer of tires wants
to establish the warranty on the tires. He wants to replace for
free only 4% of the...

A taxi company is trying to decide whether to purchase brand A
or brand B tires for its fleet of taxis. To estimate the difference
in the two brands, an experiment is conducted using 15 of each
brand. The tires are run until they wear out. The sample average
and standard deviation in kms for brand A are 35,400 and 4000
respectively. The sample average and standard deviation in kms for
brand B are 37,800 and 6600 respectively. Compute a...

You are interested in determining which of two brands of
batteries, brand A and brand B, lasts longer under differing
conditions of use. One hundred Fenix flashlights are fitted with
brand A batteries and 100 Olight flashlights are fitted with brand
B batteries. Each battery is used for 72 hours straight. The
battery life is then measured for each battery, and the average
battery life for the two brands is compared. What is wrong with
this experimental design? (3 points)...

1. A taste test is conducted between two brands of diet cola,
Brand A and Brand B, to determine if there is evidence that more
people prefer Brand A. A total of 100 people participate in the
taste test.
a. If people prefer Brand A and Brand B equally, what proportion
of the taste test participants would we expect to choose Brand
A?
b. Define the relevant parameter(s) (that is, describe in words
with proper notation) and then state the...

A particular brand of tires claims that its deluxe tire averages
at least 50,000 miles before it needs to be replaced. From past
studies of this tire, the standard deviation is known to be 8,000.
A survey of owners of that tire design is conducted. Of the 29
tires surveyed, the mean lifespan was 46,600 miles with a standard
deviation of 9,800 miles. Using alpha = 0.05, is the data highly
consistent with the claim? Note: If you are using...

A manufacturer claims that the life span of its tires is
48,000
miles. You work for a consumer protection agency and you are
testing these tires. Assume the life spans of the tires are
normally distributed. You select
one hundred
tires at random and test them. The mean life span is
47,858
miles. Assume
sigmaσequals=900
Complete parts (a) through (c).
(a) Assuming the manufacturer's claim is correct, what is the
probability that the mean of the sample is
47,858
miles...

name a brand to which you are brand loyal and name a
product category that you switch brands frequently.
Why do you exhibit different behavior in these two product
categories?

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...

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