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Julli [10]
3 years ago
6

A weightlifter can increase the weight W(x) that she can lift according to W(x) = 315(1.05)", where x represents the number of t

raining cycles completed. How much will she
lift after 4 training cycles?
Mathematics
1 answer:
labwork [276]3 years ago
8 0

Answer:

She will lift 383 units.

Step-by-step explanation:

The amount of weight that she can lift after x cycles is given by:

W(x) = 315(1.05)^x

How much will she lift after 4 training cycles?

This is W when x = 4, that is, W(4). So

W(x) = 315(1.05)^4 = 383

She will lift 383 units.

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A research study investigated differences between male and female students. Based on the study results, we can assume the popula
garri49 [273]

Using the <u>normal distribution and the central limit theorem</u>, it is found that the interval that contains 99.44% of the sample means for male students is (3.4, 3.6).

In a normal distribution with mean \mu and standard deviation \sigma, the z-score of a measure X is given by:

Z = \frac{X - \mu}{\sigma}

  • It measures how many standard deviations the measure is from the mean.  
  • After finding the z-score, we look at the z-score table and find the p-value associated with this z-score, which is the percentile of X.
  • By the Central Limit Theorem, the sampling distribution of sample means of size n has standard deviation s = \frac{\sigma}{\sqrt{n}}.

In this problem:

  • The mean is of \mu = 3.5.
  • The standard deviation is of \sigma = 0.5.
  • Sample of 100, hence n = 100, s = \frac{0.5}{\sqrt{100}} = 0.05

The interval that contains 95.44% of the sample means for male students is <u>between Z = -2 and Z = 2</u>, as the subtraction of their p-values is 0.9544, hence:

Z = -2:

Z = \frac{X - \mu}{\sigma}

By the Central Limit Theorem

Z = \frac{X - \mu}{s}

-2 = \frac{X - 3.5}{0.05}

X - 3.5 = -0.1

X = 3.4

Z = 2:

Z = \frac{X - \mu}{s}

2 = \frac{X - 3.5}{0.05}

X - 3.5 = 0.1

X = 3.6

The interval that contains 99.44% of the sample means for male students is (3.4, 3.6).

You can learn more about the <u>normal distribution and the central limit theorem</u> at brainly.com/question/24663213

7 0
2 years ago
Researchers investigated whether insomnia is related to education status. Adults living in a certain region were selected to par
Degger [83]

Answer:

A) 8 treatments

  1. Normal​ sleeper, high school dropout
  2. Normal​ sleeper, high school graduate
  3. .Normal​ sleeper, college graduate
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  6. Chronic​ insomnia, high school dropout
  7. Normal​ sleeper, some college
  8. Chronic​ insomnia, some college

B) 8 treatments

Step-by-step explanation:

<u>A) determine the number of treatments for this study </u>

The number of treatments for this study can be determined as : 2 * 4 = 8 treatments

and they are :

  1. Normal​ sleeper, high school dropout
  2. Normal​ sleeper, high school graduate
  3. .Normal​ sleeper, college graduate
  4. Chronic​ insomnia, college graduate
  5. Chronic​ insomnia, high school graduate
  6. Chronic​ insomnia, high school dropout
  7. Normal​ sleeper, some college
  8. Chronic​ insomnia, some college

B) eight (8 ) treatments

7 0
3 years ago
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