An energy company wants to choose between two regions in a state to install​ energy-producing wind turbines. A researcher claims that the wind speed in Region A is less than the wind speed in Region B. To test the​ regions, the average wind speed is calculated for 60 days in each region. The mean wind speed in Region A is 13.9 miles per hour. Assume the population standard deviation is 2.7 miles per hour. The mean wind speed in Region B is 15.2 miles per hour. Assume the population standard deviation is 3.1 miles per hour. At α=0.05​, can the company support the​ researcher's claim? Complete parts​ (a) through​ (d) below. ​(a) Identify the claim and state H0 and Ha.   What is the​ claim?     A. The wind speed in Region A is the same as the wind speed in Region B.   B. The wind speed in Region A is less than the wind speed in Region B.   C. The wind speed in Region A is not greater than the wind speed in Region B.   D. The wind speed in Region A is not less than the wind speed in Region B.   Let Region A be sample 1 and let Region B be sample 2. Identify H0 and Ha.   H0​: μ1   greater than or equals≥ less than or equals≤ greater than> less than< not equals≠       μ2 Ha​: μ1     greater than or equals≥ less than or equals≤ greater than> less than< not equals≠   ​(b) Find the critical​ value(s) and identify the rejection region.   The critical​ value(s) is/are z0= ​(Round to three decimal places as needed. Use a comma to separate answers as​ needed.)   What is the rejection​ region? Select the correct choice below and fill in the answer​ box(es) within your choice. ​(Round to three decimal places as​ needed.)   A. z< or z>   B. z>   C. z< ​(c) Find the standardized test statistic z.   z= ​(Round to two decimal places as​ needed.)   d) Decide whether to reject or fail to reject the null hypothesis and interpret the decision in the context of the original claim.   ▼     H0. There     is not or is enough evidence at the 5​% level of significance to ▼   reject or support the​ researcher's claim that the wind speed in Region A is ▼ the same as less then not greater than not less than   the wind speed in Region B.

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An energy company wants to choose between two regions in a state to install​ energy-producing wind turbines. A researcher claims that the wind speed in Region A is less than the wind speed in Region B. To test the​ regions, the average wind speed is calculated for

60

days in each region. The mean wind speed in Region A is

13.9

miles per hour. Assume the population standard deviation is

2.7

miles per hour. The mean wind speed in Region B is

15.2

miles per hour. Assume the population standard deviation is

3.1

miles per hour. At

α=0.05​,

can the company support the​ researcher's claim? Complete parts​ (a) through​ (d) below.

​(a) Identify the claim and state
H0
and
Ha.
 
What is the​ claim?
 
 
A.
The wind speed in Region A is the same as the wind speed in Region B.
 
B.
The wind speed in Region A is less than the wind speed in Region B.
 
C.
The wind speed in Region A is not greater than the wind speed in Region B.
 
D.
The wind speed in Region A is not less than the wind speed in Region B.
 
Let Region A be sample 1 and let Region B be sample 2. Identify
H0
and
Ha.
 
H0​:
μ1
 
greater than or equals≥
less than or equals≤
greater than>
less than<
not equals≠
 
 
 
μ2
Ha​:
μ1
 
 
greater than or equals≥
less than or equals≤
greater than>
less than<
not equals≠
 
​(b) Find the critical​ value(s) and identify the rejection region.
 
The critical​ value(s) is/are
z0=
​(Round to three decimal places as needed. Use a comma to separate answers as​ needed.)
 
What is the rejection​ region? Select the correct choice below and fill in the answer​ box(es) within your choice.
​(Round to three decimal places as​ needed.)
 
A.
z<
or
z>
 
B.
z>
 
C.
z<
​(c) Find the standardized test statistic z.
 
z=
​(Round to two decimal places as​ needed.)
 
d) Decide whether to reject or fail to reject the null hypothesis and interpret the decision in the context of the original claim.
 
 
 
H0.
There
 
 
is not
or
is
enough evidence at the
5​%
level of significance to
 
reject
or
support
the​ researcher's claim that the wind speed in Region A is
the same as
less then
not greater than
not less than
 
the wind speed in Region B.
 
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