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LuckyWell [14K]
1 year ago
14

The sampling distribution of certain statistical measures shows a normal distribution which of the following is an unbiased esti

mator that has a graph that is normally distributed and is not skewed
a. proportion
b. median
c. range
d. variance
Mathematics
2 answers:
PilotLPTM [1.2K]1 year ago
7 0

GACA

Answer: 1. B) Normal distribution

2. D) Variance, mean, proportion

3. D) normal distribution

4. D) normal distribution

5. A) proportion

6. A) median

7. C) this is just one sample. The sampling distribution of the mean requires repeating this process with the same sample several times

8. A) not a normal distribution

9. B) mean, variance, proportion

10. A) the sampling distribution of the variance requires repeating this process with the same sample several times. So this does not compare to the sampling distribution of the variance

Step-by-step explanation: 100% :)

svlad2 [7]1 year ago
4 0

Answer:

A) Proportion.

Step-by-step explanation:

The distribution of sample proportions leads or may tends to approximate a normal distribution and is an unbiased estimator that has a graph that is usually distributed and is not skewed. In other words, simply, we can also say that the population proportion is basically defined to be as the mean of the sample proportion. The population proportion is basically equaled the expected value of the sample proportion.

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<em>The viewer mistakenly determined that one of the equations in the system should be 2 x + y = 28. Instead modifications should have been made before applying the equation.</em>

Step-by-step explanation:

Given

Total Questions = 20

Total Points = 28

Correct Answers = +2 points

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Required

Spot the error in the viewer's calculation

The viewer represents the correct answers with x and the incorrect ones with y.

This implies that

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Also, for every correct answers, she gets 2 points;

<em>This can be represented by 2x</em>

and for every incorrect answers, she gets -1 point

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This implies that

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This is where the viewer made a mistake

The viewer's mistake is that; instead of subtracting total incorrect points from the correct points, the viewer added them together;

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2x - y = 28

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Step-by-step explanation:

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Answer:

  1.  B. $352.19
  2.  B. $9,126.53
  3.  D. $123,866.02

Step-by-step explanation:

First of all, the formulas need to be written correctly, and you need to understand what the variables mean. Usually, the variables have these meanings:

  • A — the amount you're trying to find, often a payment or balance
  • P — the principal amount invested or borrowed
  • r — the interest rate, often annual, sometimes the rate for the interval
  • n — the number of intervals in the year for purposes of interest compounding
  • t — the number of years (or intervals)

Usually, an annual interest rate is quoted and compounding is annual (n=1), quarterly (n=4) or monthly (n=12). In some formulas, r is the monthly rate and n is the number of months (there is no "t" in such formulas).

When we say "written correctly", we mean that parentheses are needed around exponents and denominators. In the formulas you have here, necessary parentheses are missing or misplaced, so you cannot use these formulas directly in your calculator or spreadsheet. If you're copying formulas from a question where they're typeset, be aware of the grouping effect of fraction bars and superscripts and use parentheses accordingly.

In the first two problems, you're not given P directly. Rather, the principal invested is to be computed as 10% of the amount given as "earnings."

___

1. P = $147; r = 0.035; n = 12; t = 25.

  A = P(1 + r/n)^(nt) = 147·(1 + .035/12)^(12·25) ≈ 147·1.002916667^300

  A ≈ 352.19 . . . . matches choice B

___

2. P = $3600; r = 0.0625; n = 4; t = 15.

  A = P(1 + r/n)^(nt) = 3600·(1 + .0625/4)^(4·15) ≈ 3600·1.01625^60

  A ≈ 9126.53 . . . . matches choice B

___

3. P = $208; r = 0.05/12; n = 300. Here, r is the monthly rate, n is the number of months. Please note the correction of the formula. The variable "S" refers to the Sum of payments and interest. This is effectively the sum of a geometric sequence, so the formula should look familiar on that basis.

  S = P((1 +r)^n -1)/r = 208·((1.004166667^300 -1)/0.004166667

  S ≈ 123,866.02 . . . . matches choice D

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