To test H0: σ=2.2 versus H1: σ>2.2​, a random sample of size n=17 is obtained from a population that is known to be normally distributed. Complete parts​ (a) through​ (d). ​(a) If the sample standard deviation is determined to be s=2.4​, compute the test statistic.   χ20=nothing ​(Round to three decimal places as​ needed.) ​(b) If the researcher decides to test this hypothesis at the

Calculus For The Life Sciences
2nd Edition
ISBN:9780321964038
Author:GREENWELL, Raymond N., RITCHEY, Nathan P., Lial, Margaret L.
Publisher:GREENWELL, Raymond N., RITCHEY, Nathan P., Lial, Margaret L.
Chapter13: Probability And Calculus
Section13.2: Expected Value And Variance Of Continuous Random Variables
Problem 10E
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To test
H0: σ=2.2
versus
H1: σ>2.2​,
a random sample of size
n=17
is obtained from a population that is known to be normally distributed. Complete parts​ (a) through​ (d).
​(a) If the sample standard deviation is determined to be
s=2.4​,
compute the test statistic.
 
χ20=nothing
​(Round to three decimal places as​ needed.)
​(b) If the researcher decides to test this hypothesis at the
α=0.01
level of​ significance, determine the critical value.
 
χ20.01=nothing
​(Round to three decimal places as​ needed.)
​(c) Draw a​ chi-square distribution and depict the critical region.
 
 
 
 
 
 
 
 
3219.04
 
  •  
  •  
  •  
A graph has a horizontal axis with two labeled coordinates at 19.04 and 32 and an unlabeled vertical axis. The graph contains a chi-square distribution curve that rises from left to right at an increasing and then decreasing rate to a peak about one quarter of the way from the left edge of the graph and then falls from left to right at an increasing and then decreasing rate to the right edge of the graph. There are two vertical lines that extend from the horizontal axis to the curve. The leftmost line is at 19.04 and is to the right of the peak. The rightmost line is at 32 and is to the right of the peak. The region under the curve to the right of the rightmost line is shaded.
 
 
 
 
 
 
 
 
5.81232.000
 
  •  
  •  
  •  
A graph has a horizontal axis with two labeled coordinates at 5.812 and 32.000 and an unlabeled vertical axis. The graph contains a chi-square distribution curve that rises from left to right at an increasing and then decreasing rate to a peak about one quarter of the way from the left edge of the graph and then falls from left to right at an increasing and then decreasing rate to the right edge of the graph. There are two vertical lines that extend from the horizontal axis to the curve. The leftmost line is at 5.812 and is to the left of the peak. The rightmost line is at 32.000 and is to the right of the peak. The regions under the curve between the vertical axis and the leftmost line and to the right of the rightmost line are shaded.
 
 
 
 
 
 
 
5.81232.000
 
  •  
  •  
  •  
A graph has a horizontal axis with two labeled coordinates at 5.812 and 32.000 and an unlabeled vertical axis. The graph contains a chi-square distribution curve that rises from left to right at an increasing and then decreasing rate to a peak about one quarter of the way from the left edge of the graph and then falls from left to right at an increasing and then decreasing rate to the right edge of the graph. There are two vertical lines that extend from the horizontal axis to the curve. The leftmost line is at 5.812 and is to the left of the peak. The rightmost line is at 32.000 and is to the right of the peak. The region under the curve between the vertical axis and the leftmost line is shaded.
 
 
 
 
 
 
 
3219.04
 
  •  
  •  
  •  
A graph has a horizontal axis with two labeled coordinates at 19.04 and 32 and an unlabeled vertical axis. The graph contains a chi-square distribution curve that rises from left to right at an increasing and then decreasing rate to a peak about one quarter of the way from the left edge of the graph and then falls from left to right at an increasing and then decreasing rate to the right edge of the graph. There are two vertical lines that extend from the horizontal axis to the curve. The leftmost line is at 19.04 and is to the right of the peak. The rightmost line is at 32 and is to the right of the peak. The region under the curve between the two vertical lines is shaded.
​(d) Will the researcher reject the null​ hypothesis?
 
 
Do not reject
H0
because
χ20<χ20.01.
 
Reject
H0
because
χ20>χ20.01.
 
Do not reject
H0
because
χ20>χ20.01.
 
Reject
H0
because
χ20<χ20.01.
 
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ISBN:
9780321964038
Author:
GREENWELL, Raymond N., RITCHEY, Nathan P., Lial, Margaret L.
Publisher:
Pearson Addison Wesley,