Question

The Toylot company makes an electric train with a motor that it
claims will draw an average of *no more than* 0.8 amps under
a normal load. A sample of nine motors were tested, and it was
found that the mean current was *x* = 1.30 amps, with a
sample standard deviation of *s* = 0.43 amps. Perform a
statistical test of the Toylot claim. (Use a 1% level of
significance.)

What are we testing in this problem?

single proportionsingle mean

What is the level of significance?

State the null and alternate hypotheses.

*H*_{0}: *μ* = 0.8;
*H*_{1}: *μ* ≠ 0.8*H*_{0}:
*p* ≤ 0.8; *H*_{1}: *p* >
0.8 *H*_{0}: *p* ≠
0.8; *H*_{1}: *p* =
0.8*H*_{0}: *p* = 0.8;
*H*_{1}: *p* ≠ 0.8*H*_{0}:
*μ* ≠ 0.8; *H*_{1}: *μ* =
0.8*H*_{0}: *μ* ≤ 0.8;
*H*_{1}: *μ* > 0.8

What sampling distribution will you use? What assumptions are you
making?

The standard normal, since we assume that *x* has a
normal distribution with unknown *σ*.The standard normal,
since we assume that *x* has a normal distribution with
known *σ*. The Student's *t*,
since we assume that *x* has a normal distribution with
known *σ*.The Student's *t*, since we assume that
*x* has a normal distribution with unknown *σ*.

What is the value of the sample test statistic? (Round your answer
to three decimal places.)

Estimate the *P*-value.

*P*-value > 0.2500.125 < *P*-value <
0.250 0.050 < *P*-value <
0.1250.025 < *P*-value < 0.0500.005 <
*P*-value < 0.025*P*-value < 0.005

Sketch the sampling distribution and show the area corresponding to
the *P*-value.

Will you reject or fail to reject the null hypothesis? Are the data
statistically significant at level *α*?

At the *α* = 0.01 level, we reject the null hypothesis
and conclude the data are statistically significant.At the
*α* = 0.01 level, we reject the null hypothesis and conclude
the data are not statistically
significant. At the *α* = 0.01 level,
we fail to reject the null hypothesis and conclude the data are
statistically significant.At the *α* = 0.01 level, we fail
to reject the null hypothesis and conclude the data are not
statistically significant.

Interpret your conclusion in the context of the application.

There is sufficient evidence at the 0.01 level to conclude that the toy company claim of no more than 0.8 amps is too low.There is insufficient evidence at the 0.01 level to conclude that the toy company claim of no more than 0.8 amps is too low.

6.

Answer #1

The statistical software output for this problem is:

From above output:

What are we testing? Single mean

Level of significance = 0.01

Hypotheses: *H*0: *μ* ≤ 0.8; *H*1:
*μ* > 0.8

Sampling distribution: **Option D**

Test statistic = **3.488**

*P*-value < 0.005

At the *α* = 0.01 level, we reject the null hypothesis
and conclude the data are statistically significant.

There is sufficient evidence at the 0.01 level to conclude that the toy company claim of no more than 0.8 amps is too low.

The Toylot company makes an electric train with a motor that it
claims will draw an average of only 0.8 ampere (A) under a normal
load. A sample of nine motors was tested, and it was found that the
mean current was x = 1.40 A, with a sample standard
deviation of s = 0.46 A. Do the data indicate that the
Toylot claim of 0.8 A is too low? (Use a 1% level of
significance.)
What are we testing...

The Toylot company makes an electric train with a motor that it
claims will draw an average of no more than 0.8 amps under
a normal load. A sample of nine motors were tested, and it was
found that the mean current was x = 1.32 amps, with a
sample standard deviation of s = 0.41 amps. Perform a
statistical test of the Toylot claim. (Use a 1% level of
significance.)
A. What are we testing in this problem?
Option...

The Toylot company makes an electric train with a motor that it
claims will draw an average of no more than 0.8 amps under a normal
load. A sample of nine motors were tested, and it was found that
the mean current was x = 1.32 amps, with a sample standard
deviation of s = 0.43 amps. Perform a statistical test of the
Toylot claim. (Use a 1% level of significance.)
a.) What are we testing in this problem?
-single...

The Toylot company makes an electric train with a motor that it
claims will draw an average of only 0.8 ampere (A) under a normal
load. A sample of nine motors was tested, and it was found that the
mean current was x = 1.32 A, with a sample standard
deviation of s = 0.44 A. Do the data indicate that the
Toylot claim of 0.8 A is too low? (Use a 1% level of
significance.)
What are we testing...

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have an average of 40 matches per box, with σ = 8. A
random sample of 96 matchboxes shows the average number of matches
per box to be 42.3. Using a 1% level of significance, can you say
that the average number of matches per box is more than 40?
What are we testing in this problem?
single meansingle proportion
(a) What is the level of significance?
State the null...

The Nero Match Company sells matchboxes that are supposed to
have an average of 40 matches per box, with σ = 10. A
random sample of 94 matchboxes shows the average number of matches
per box to be 42.9. Using a 1% level of significance, can you say
that the average number of matches per box is more than 40?
What are we testing in this problem?
single proportionsingle mean
What is the level of significance?
State the null and...

Let x be a random variable representing dividend yield
of bank stocks. We may assume that x has a normal
distribution with σ = 2.8%. A random sample of 10 bank
stocks gave the following yields (in percents).
5.7
4.8
6.0
4.9
4.0
3.4
6.5
7.1
5.3
6.1
The sample mean is x = 5.38%. Suppose that for the
entire stock market, the mean dividend yield is μ = 4.7%.
Do these data indicate that the dividend yield of all...

Let x be a random variable representing dividend yield
of bank stocks. We may assume that x has a normal
distribution with σ = 3.1%. A random sample of 10 bank
stocks gave the following yields (in percents).
5.7
4.8
6.0
4.9
4.0
3.4
6.5
7.1
5.3
6.1
The sample mean is x = 5.38%. Suppose that for the
entire stock market, the mean dividend yield is μ = 5.0%.
Do these data indicate that the dividend yield of all...

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of bank stocks. We may assume that x has a normal
distribution with σ = 3.2%. A random sample of 10 bank
stocks gave the following yields (in percents).
5.7
4.8
6.0
4.9
4.0
3.4
6.5
7.1
5.3
6.1
The sample mean is x = 5.38%. Suppose that for the
entire stock market, the mean dividend yield is μ = 4.5%.
Do these data indicate that the dividend yield of all...

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