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hichkok12 [17]
3 years ago
11

Just before a referendum on a school​ budget, a local newspaper polls 402 voters to predict whether the budget will pass. Suppos

e the budget has the support of 52​% of the voters. What is the probability that the​ newspaper's sample will lead it to predict​ defeat?
Mathematics
1 answer:
Sliva [168]3 years ago
7 0

Answer:

21.21%

Step-by-step explanation:

Assume that proportion of support follows normal distribution.For resulting in defeat the proportion of support should less than 0.5.Given that the proportion of support is p= 0.52.

Sample size(n)= 402

We know that standard deviation is given as

\sigma = \sqrt {\dfrac {p(1-p)}{n}}

Now by putting the values

\sigma = \sqrt {\dfrac{0.52\times 0.48}{402}}

σ=0.0249

Proportion of support follows normal distribution with mean is 0.52 and standard deviation is 0.0249

We know that Z=\dfrac{\bar{X}-\mu }{\sigma }

So

Z=\dfrac{0.5-0.52 }{0.0249}

Z= -0.80

So P(Z<-.80) =0.2118 from standard table.

So the probability of news paper to predict defeat is 21.21%

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