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Neporo4naja [7]
3 years ago
9

he mayor of a town has proposed a plan for the construction of an adjoining community. A political study took a sample of 160016

00 voters in the town and found that 344% of the residents favored construction. Using the data, a political strategist wants to test the claim that the percentage of residents who favor construction is over 311%. Find the value of the test statistic. Round your answer to two decimal places.
Mathematics
1 answer:
Diano4ka-milaya [45]3 years ago
4 0

Answer:

2.60

Step-by-step explanation:

Given that:

n = 1600

\hat p = 0.34

P_o = 0.31

The test statistics can be computed as:

Z = \dfrac{\hat p - P_o}{\sqrt{ \dfrac{P_o\times (1-P_o) } {n} }}

Z = \dfrac{0.34-0.31}{\sqrt{ \dfrac{0.31 \times (1-0.31) } {1600} }}

Z = \dfrac{0.03}{\sqrt{ \dfrac{0.31 \times (0.69) } {1600} }}

Z = \dfrac{0.03}{\sqrt{ \dfrac{0.2139} {1600} }}

Z = 2.60

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Answer:

(a) The amount of ice cream increase as temperature increases

(b)

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Step-by-step explanation:

Given

See attachment for graph

Solving (a): The relationship between the variables

From the attached graph, the dots on the graph increases towards up-right direction. This implies that there is a positive correlation between the variables.

In other words;

The amount of ice cream increase as temperature increases

Solving (b): The line of best fit

First, we draw a line through the points (the line should have almost equal points on both sides; see attachment 2).

From (2), we select any 2 points on the line:

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The slope (m) is:

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m = \frac{5-35}{0-15}

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Substitute known values:

y = 2(x - 0) + 5

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y = 2x + 5

The y-intercept is when x=0

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y = 2*0 + 5

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Step-by-step explanation:

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