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Ahat [919]
2 years ago
7

Which of these tables represents a function

Mathematics
1 answer:
cricket20 [7]2 years ago
7 0

Answer:

A: Table W.

Step-by-step explanation:

A function for tables are where the X-input NEVER repeat.

Graph W. Doesn't have any repeating inputs on the x side

Y can repeat as much as the problem make wants but the x CAN NOT.

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Answer:

Step-by-step explanation:

a) We would set up the hypothesis test. This is a test of a single population mean since we are dealing with mean

For the null hypothesis,

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This is a 2 tailed test

Since the population standard deviation is given, z score would be determined from the normal distribution table. The formula is

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Looking at the normal distribution table, the probability corresponding to the area above the z score is 1 - 0.99461 = 0.00539

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The difference between sample sample mean and population mean is 9.9 - 9 = 0.9

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the x value for the right tail is 9 + 0.9 = 9.9

These means are higher and lower than the null mean. Thus, they are evidence in favour of the alternative hypothesis. We will look at the area in both tails. Since it is showing in one tail only, we would double the area. We already got the area above the z score as z = 0.00539

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But we are told to use the critical value approach, then

Since α = 0.01, the critical value is determined from the normal distribution table.

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b) we would assume normal distribution because the sample size is sufficiently large and the population standard deviation is known.

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Since the sample size is large and the population standard deviation is known, we would use the following formula and determine the z score from the normal distribution table.

Margin of error = z × σ/√n

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