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ankoles [38]
3 years ago
9

Some researchers have conjectured that stem-pitting disease in peach tree seedlings might be controlled with weed and soil treat

ment. An experiment was conducted to compare peach tree seedling growth with soil and weeds treated with one of the two herbicides. In a field containing 10 seedlings, five were randomly selected throughout the field and assigned to receive Herbicide A. The remainder was to receive Herbicide B. Soil and weeds for each seedling were treated with the appropriate herbicide, and, at the end of the study period, the height (cm) was recorded for each seedling. The following results were obtained: Herbicide A 87, 80, 80, 76, 73 Herbicide B 78, 77, 74, 68, 62 A 90% confidence interval for the difference in mean heights for the two herbicides is (0.2, 14.6). Which of the following statements is correct? The P-value for a test of the null hypothesis of equal means and the alternative of different means would be greater than 10% because the interval doesn't include 0. Neither of those statements is correct. A 95% confidence interval could not include 0, because we would be even more confident of a difference in the groups.
Mathematics
1 answer:
Murljashka [212]3 years ago
8 0

Answer:

The first choice

Step-by-step explanation:

The choice of "The P-value for a test of the null hypothesis of equal means and the alternative of different means would be greater than 10% because the interval doesn't include 0" is the correct choice because the lower bound of the confidence interval is 0.2.  

Since we are looking at an interval based on the difference of heights, we are 95% sure the lowest difference is 0.2, or 20%.  Choosing  10% as a test value for a hypothesis test is a good value to choose since it's lower than the lowest bound of the confidence interval

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What is the image of the point (-7,4) after a rotation of 180 counterclockwise about the origin?
777dan777 [17]

Answer:

(-7,-4)

Step-by-step explanation:

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7 0
2 years ago
After a college football team once again lost a game to their archrival, the alumni association conducted a survey to see if alu
valentina_108 [34]

Answer:

P-value for this hypothesis test is 0.00175.

Step-by-step explanation:

We are given that the alumni association conducted a survey to see if alumni were in favor of firing the coach.

A simple random sample of 100 alumni from the population of all living alumni was taken. Sixty-four of the alumni in the sample were in favor of firing the coach.

<u><em>Let p = proportion of all living alumni who favored firing the coach</em></u>

SO, Null Hypothesis, H_0 : p = 0.50   {means that the majority of alumni are not in favor of firing the coach}

Alternate Hypothesis, H_A : p > 0.50   {means that the majority of alumni are in favor of firing the coach}

The test statistics that will be used here is <u>One-sample z proportion</u> <u>statistics</u>;

                                  T.S.  = \frac{\hat p-p}{{\sqrt{\frac{\hat p(1-\hat p)}{n} } } } }  ~ N(0,1)

where, \hat p  = sample proportion of the alumni in the sample who were in favor of firing the coach = \frac{64}{100} = 0.64

            n = sample of alumni = 100

So, <em><u>test statistics</u></em>  =  \frac{0.64-0.50}{{\sqrt{\frac{0.64(1-0.64)}{100} } } } }

                               =  2.92

<u>Now, P-value of the hypothesis test is given by ;</u>

         P-value = P(Z > 2.92) = 1 - P(Z \leq 2.92)

                                             = 1 - 0.99825 = 0.00175

Therefore, the P-value for this hypothesis test is 0.00175.

4 0
3 years ago
Pq + 4; use p=4, and q = 4
dangina [55]

Answer:

20

Step-by-step explanation:

pq + 4

Given:

p = 4

q = 4

We plug the numbers in:

pq + 4

4(4) + 4

16 + 4

20

5 0
3 years ago
Read 2 more answers
I need help thanks.
melomori [17]
If this shape is trapezium
m (<D) = m (<C)
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3 0
3 years ago
Which numbers produce an irrational number when added to 5/8
uranmaximum [27]

Answer:

Irrational numbers

Step-by-step explanation:

Any irrational number plus a rational number like (5/8) creates another  irrational number.

3 0
3 years ago
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