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schepotkina [342]
3 years ago
15

Physicians at a clinic gave what they thought were drugs to 860 patients. Although the doctors later learned that the drugs were

really placebos,59% of the patients reported an improved condition. Assume that if the placebo is ineffective, the probability of a patients condition improving is 0.55. Test the hypotheses that the proportion of patients improving is >0.55
Find the test statistics:

z=


Find the p-value.
p=
Mathematics
1 answer:
Alexus [3.1K]3 years ago
4 0

Answer:

Z=2.36

P=0.0091

Step-by-step explanation:

The hypothesis is:

π > 0.55 which is the population proportion

The formula to get the test statistic is

Zstat = P-π/√π(1-π)/n

P =507.4/860 = 0.59 (sample proportion )

n =860 (sample size)

π =0.55(population porportion)

Zstat = 0.59-0.55/√0.55(1-0.55)/860

Zstat =2.36

From Z table the probability of Z score of 2.36 is 0.9909

To calculate for P- value will then be

P= 1 - 0.9909

P= 0.0091

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Applying trigonometric ratios, the missing segments lengths in the image attached below are: <em>a = 8√3; b = 12.</em>

<h3>The Trigonometric Ratios</h3>
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  • CAH is cos ∅ = adj/hyp
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Given the right triangle in the mage attached below, we would find the missing sides as follows:

<em>Find a:</em>

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sin 30 = (4√3)/a

a = (4√3)/sin 30

a = (4√3)/(1/2) (sin 30 = 1/2)

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<em>Find b:</em>

Reference angle (∅) = 60°

opposite = b

adjacent = 4√3

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tan 60 = b/(4√3)

b = tan 60 × 4√3

b = √3 × 4√3

b = 12

Therefore, applying trigonometric ratios, the missing segments lengths in the image attached below are: <em>a = 8√3; b = 12.</em>

Learn more about trigonometric ratios on:

brainly.com/question/4326804

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Step-by-step explanation:

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