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Kruka [31]
3 years ago
14

1. Investigate if there is an association between survival past 500 days and treatment group.(a) Create a variable that indicate

s whether each observation survived >= 500 days.(b)What are the two tests that could be used to answer this question? What are the null andalternative hypotheses for each test? When is each test appropriate?(c)Perform the chi-squared test to investigate if there is an association between survival past 500 daysand treatment group. Does one treatment group have a better outcome than the other? Write abrief paragraph to summarize your results. Your summary does not need to include a confidenceinterval, but it should include basic descriptive statistics.(d)Explain why the analysis performed is not sufficient to make definitive conclusions regarding theefficacy of the two treatment groups.
Mathematics
1 answer:
vekshin13 years ago
3 0

Answer:

There is association between survival and treatment H1: there is no association between survival and treatment.

Step-by-step explanation:

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3 years ago
257/5000 In an envelope there are 20 ballots, 8 have drawn a car the rest are white. Find the probability to extract at least on
Gwar [14]

Answer:

Step-by-step explanation:

There are 20 ballots, 8 have drawn a car the rest are white.

Find the probability to extract at least one ballot with the drawing of a car if not replaced:

1. If a ballot is taken out:

8 have drawn a car: thus we have 8/20 = 2/5

2. If two ballots are removed, probability of extracting 1 ballot with drawing of car is 8/20 leaving 7 out of 19 remaining. The 7/19 is the probability of drawing out a second ballot with the drawing of a car. Thus we have

8/20 * 7/19 = 56/380 = 14/95

3. If three ballots are removed, probability of extracting 1 ballot with drawing of car is 8/20 leaving 7 out of 19 remaining. The 7/19 is the probability of drawing out a second ballot with the drawing of a car leaving 6 out of 18 remaining. The 6/18 is the probability of drawing out a third ballot with the drawing of a car.

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5 0
3 years ago
Find the area of a circle with a circumference of 31.5 units
Westkost [7]

Answer:

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Step-by-step explanation:

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3 years ago
How do I do this while I show all my work?
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3 years ago
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If each side of a cube is 4cm find its volume​
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Answer:

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4 0
3 years ago
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