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iogann1982 [59]
3 years ago
9

What is 200 + 6d=800 what is d

Mathematics
2 answers:
Arturiano [62]3 years ago
8 0

Answer:

d =100

Step-by-step explanation:

200 + 6d=800

Subtract 200 from each side

200-200 + 6d=800-200

6d = 600

Divide each side by 6

6d/6 = 600/6

d = 100

Darya [45]3 years ago
4 0

Answer:

100

Step-by-step explanation:

200 + 6d = 800

Subtract 200 from each side: 6d=600

Divide 6 from each side: d=100

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This question is incomplete, the complete question;

The American Psychological Associated conducted a survey in 2003 of psychologists to estimate the average incomes for psychologists based on their academic degree and years of experience. 36 psychologists responded who had a just received their masters degree in 2003. The average was $48,800 with a standard deviation of $16,800.

The 95% Confidence Interval is ($, $ )

Answer:

at 95%, confidence interval is ( $43312, $54288 )

Step-by-step explanation:

Given the data in the question;

sample size n = 36

mean x' = 48,800

standard deviation σ = 16,800

at 95% confidence level;

∝ = 1 - 95% = 1 - 0.95 = 0.05

∝/2 = 0.05 / 2 = 0.025

z critical value, Z_{\alpha/2 = 1.96

now, confidence interval for population mean is given by the formula

x' ±  Z_{\alpha/2( σ/√n )

so we substitute

⇒ 48800 ±  1.96( 16800/√36 )

⇒ 48800 ±  1.96( 2800 )

⇒ 48800 ±  5488

⇒ 48800 -  5488, 48800 +  5488

⇒ ( 43312, 54288 )

Therefore, at 95%, confidence interval is ( $43312, $54288 )

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Answer:

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