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Anni [7]
3 years ago
5

A teacher gives a test in which the average of the test scores is 68 and the standard deviation is 14. Realizing that the test w

as probably too difficult, the teacher decides to scale the tests by adding 10 points to all scores. What is the mean and standard deviation of the scaled test scores?
Mathematics
1 answer:
Alika [10]3 years ago
6 0

Answer:

Mean = 78 ;

Standard deviation = 14

Step-by-step explanation:

Given that:

Mean score = 68

Standard deviation = 14

When a constant value is added to the individual value of a dataset, the new mean value will become the sum of the initial mean value and the constant term added to the values.

Constant Added score = 10

The mean of scaled test score will be:

Mean score + constant added score

68 + 10 = 78

The standard deviation remains unchanged ; Hence, standard deviation = 14

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Suppose you were considering going bungee jumping, but would only go if the mean breaking strength of the cord was greater than
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Answer:

Type II error will occur when we conclude that the mean breaking strength of the cord is smaller than or equal to 250 pounds but in actual it was not true.

Step-by-step explanation:

We are given that you are considering going bungee jumping, but would only go if the mean breaking strength of the cord was greater than 250 pounds.

If the mean breaking strength of the cord is greater than 250 pounds, the bungee cord will not break.

<u><em>Let </em></u>\mu<u><em> = mean breaking strength of the cord</em></u>

So, Null Hypothesis, H_0 : \mu \leq 250 pounds  

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On the other hand, alternate hypothesis states that the mean breaking strength of the cord was greater than 250 pounds.

Now, Type II error states the Probability of accepting null hypothesis given the fact that it was false or Probability of accepting the false hypothesis.

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8 0
3 years ago
What is 0.386,0.3,0.683,0.836 from greatest to least
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I hope this helps!

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3 years ago
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