Question

1.For each situation, state the null and alternative hypotheses:
(Type "mu" for the symbol ?μ , e.g. **mu >>
1** for the mean is greater than 1, **mu
<< 1** for the mean is less than 1, **mu not =
1** for the mean is not equal to 1. Please do not include
units such as "mm" or "$" in your answer.)

Harry thinks that prices in Caldwell are higher than the rest of the country. He reads that the nationwide average price of a certain brand of laundry detergent is $19.95 with standard deviation $2.18. He takes a sample from 4 local Caldwell stores and finds the average price for this same brand of detergent is $22.13.

?0 :

?? :

2.A study is conducted to determine if a newly designed text book is more helpful to learning the material than the old edition. The mean score on the final exam for a course using the old edition is 75. Ten randomly selected people who used the new text take the final exam. Their scores are shown in the table below.

Person | A | B | C | D | E | F | G | H | I | J |

Test Score | 84 | 80 | 91 | 96 | 88 | 79 | 74 | 67 | 94 | 70 |

Use a 0.010.01 significance level to test the claim that people do
better with the new edition. Assume the standard deviation is 10.5.
(Note: You may wish to use statistical software.)

Construct a 9999% confidence interval for the mean score for
students using the new text.

( ) <?<( )

Answer #1

1)

Below are the null and alternative Hypothesis,

Null Hypothesis, H0:mu = 19.95

Alternative Hypothesis, Ha: mu > 19.95

2)

sample mean, xbar = 82.3

sample standard deviation, σ = 10.5

sample size, n = 10

Given CI level is 99%, hence α = 1 - 0.99 = 0.01

α/2 = 0.01/2 = 0.005, Zc = Z(α/2) = 2.58

ME = zc * σ/sqrt(n)

ME = 2.58 * 10.5/sqrt(10)

ME = 8.57

CI = (xbar - Zc * s/sqrt(n) , xbar + Zc * s/sqrt(n))

CI = (82.3 - 2.58 * 10.5/sqrt(10) , 82.3 + 2.58 *
10.5/sqrt(10))

CI = (73.7334 , 90.8666)

For each situation, state the null and alternative
hypotheses: (Type "mu" for the symbol μμ , e.g. mu >>
1 for the mean is greater than 1, mu << 1 for the
mean is less than 1, mu not = 1 for the mean is not equal to
1. Please do not include units such as "mm" or "$" in your
answer.)
(a) The diameter of a spindle in a small motor is
supposed to be 3.7 millimeters (mm) with...

1. Find the P - value for the test statistic ?=−1.24
for the following null and alternative hypotheses:
?0: The population mean is 7.
??: The population mean is less than 7.
The P - value is
Find the P - value for the test statistic ?=−1.24 for
the following null and alternative hypotheses:
?0: The population mean is 7.
??: The population mean is not equal to 7.
The P - value is
2.
For each situation, state the...

An online used car company sells second-hand cars. For 30
randomly selected transactions, the mean price is 2000 dollars.
Part a) Assuming a population standard
deviation transaction prices of 190 dollars, obtain a 99%
confidence interval for the mean price of all transactions. Please
carry at least three decimal places in intermediate steps. Give
your final answer to the nearest two decimal places.
Confidence interval: (. , )
For each situation, state the null and alternative hypotheses:
(Type "mu" for...

(1 point) A study is conducted to determine if a newly designed
text book is more helpful to learning the material than the old
edition. The mean score on the final exam for a course using the
old edition is 75. Ten randomly selected people who used the new
text take the final exam. Their scores are shown in the table
below.
Person
A
B
C
D
E
F
G
H
I
J
Test Score
74
87
75
71
83...

For each of the following situations do the following:
1: state the null and alternative hypothese in statistical
notation.
2; indicate whether a one-tailed or two tailed test is
appropriate
3. for question A. only, define the parameters
A. The US Food and Drug Administration wants to test a new
prescription drug by the upjoh comapny to detemine if less than 3%
of people suffer a certain side effect as claimed by the
company.
B. The National Academy of Scicences...

Please answer the following Case
analysis questions
1-How is New Balance performing compared to its primary rivals?
How will the acquisition of Reebok by Adidas impact the structure
of the athletic shoe industry? Is this likely to be favorable or
unfavorable for New Balance?
2- What issues does New Balance management need to address?
3-What recommendations would you make to New Balance Management?
What does New Balance need to do to continue to be successful?
Should management continue to invest...

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