answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Amanda [17]
2 years ago
15

To evaluate the effect of a treatment, a sample of n=8 is obtained from a population with a mean of μ=40 , and the treatment is

administered to the individuals in the sample.
After treatment, the sample mean is found to be M=35 .

a. If the sample variance is s^2=32 , are the data sufficient to conclude that the treatment has a significant effect using a two-tailed test with alpha=.05

b. If the sample variance is s^2=72 , are the data sufficient to conclude that the treatment has a significant effect using a two-tailed test with alpha=.05 ?

c. Comparing your answer for parts a and b, how does the variability of the scores in the sample influence the outcome of a hypothesis test?
Mathematics
1 answer:
Westkost [7]2 years ago
5 0

Answer:

Step-by-step explanation:

a)

Test statistic:

t=\frac{35-40}{\sqrt{\frac{32}{8} } }

t=-2.5

df=8-1=7

critical, t ,values=+/-2.365

here test statistic lie in rejection region,that why null hypothesis fails  

so Yes, its significant.

b)

Test statistic:

t=\frac{35-40}{\sqrt{\frac{72}{8} } }

t=-1.67

df=8-1=7

critical, t ,values=+/-2.365

c)

sample variability increases, therefore likelihood of rejecting the null hypothesis decreases.

You might be interested in
Sharon is decreasing the size of a diagram of a leaf that is 30 centimeters long by 10 centimeters wide if the reduced diagram i
Lyrx [107]
Do it in ratio form, 30/10=x/4, 30*4=120/10=12. it will be 12 centimeters long

4 0
2 years ago
Willis bought a gallon of paint. He painted a wall that is 9 ft high and 10 ft wide. Then he used the rest of the paint to paint
GalinKa [24]
Well 9×10 is 90, 90+46 is 136. the paint covered 136 square feet
4 0
2 years ago
Read 2 more answers
S/2t=10 solve for t.
Mandarinka [93]
S/2t=10
Muliply both sides by 2t
s=20t
Divide both sides by 20 to isolate the t
Answer:
t=s/20
or
t=1/20×s
No difference between the two.

Ex: if "s" was 3, t=3/20=0.15, or t=1/20×3=0.15.


6 0
2 years ago
If you were to make a scatter plot of data, you would be able to determine the line of best fit. Using the regression equation y
VMariaS [17]

Answer:

Option B. is correct

Step-by-step explanation:

Given: The regression equation is y = 1.73 x + 0.39

To find: number of representatives for Oregon, which has a population of about 3.3 million

Solution:

The regression equation determined the specific relationship between a dependent variable and one or more independent variables.

To find number of representatives for Oregon, which has a population of about 3.3 million, put x=3.3 in the regression equation is y = 1.73 x + 0.39

y = 1.73 x + 0.39\\y = 1.73 (3.3) + 0.39\\=5.709+0.39\\=6.099\\\approx 6

So, 6 representatives for Oregon has a population of about 3.3 million

Option B. is correct

6 0
2 years ago
The following data represent weights in kilograms of maize harvest from a random sample of 72 experimental plots on St. Vincent,
Scrat [10]

Answer:

See explanation

Step-by-step explanation:

7.8 9.1 9.5 10.0 10.2 10.5 11.1 11.5 11.7 11.8

12.2 12.2 12.5 13.1 13.5 13.7 13.7 <u>14.0 14.4</u> 14.5

14.6 15.2 15.5 16.0 16.0 16.1 16.5 17.2 17.8 18.2

19.0 19.1 19.3 19.8 20.0 20.2 20.3 20.5 20.9 21.1

21.4 21.8 22.0 22.0 22.4 22.5 22.5 22.8 22.8 23.1

23.1 23.2 23.7 <u>23.8 23.8</u> 23.8 23.8 24.0 24.1 24.1

24.5 24.5 24.9 25.1 25.2 25.5 26.1 26.4 26.5 26.7

27.1 29.5

A. The five-number summary is

  • Minimum = 7.8
  • Maximum = 29.5
  • Median =\dfrac{20.2+20.3}{2}=20.25
  • Q_1=\dfrac{14.0+14.4}{2}=14.2
  • Q_3=\dfrac{23.8+23.8}{2}=23.8

B. The interquartile range is

Q_3-Q_1=23.8-14.2=9.6

C. See attached diagram

D. The distribution is not symmetric, the left half shows more data than the right part

7 0
2 years ago
Other questions:
  • Use complete sentences to describe the range of the sine function.
    13·1 answer
  • The scatterplot and trend line show a positive correlation between advertising costs and sales. The slope was found using the po
    9·2 answers
  • chris purchased a used car for 19,700. the car dereciates exponentially by 10% per year.how much will the car be worthafter 6 ye
    15·1 answer
  • A rectangular plot of land that contains 1500 square meters will be fenced and divided into two equal portions by an additional
    7·1 answer
  • Write the expression 6^7/12 in radical form.
    8·2 answers
  • In the following alphanumeric series, what letter comes next? V Q M J H
    13·1 answer
  • Which statements are true of the graph of h(x) = RootIndex 3 StartRoot x minus 4 EndRoot? Check all that apply. The domain of h(
    11·2 answers
  • A rectangle has an area of 18cm2 (squared). The lengths of the sides are whole numbers. How long could the sides of the rectangl
    5·1 answer
  • Ming used the calculations shown to find out how much he would spend on 6 pounds of ground beef if 10 pounds of ground beef cost
    5·2 answers
  • Rectangle ABCD is translated (x + 2 y - 3) and then rotated 180° about the origin. Complete the table to show the locations of A
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!