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4 years ago

Help i dont really understand this question

Mathematics

1 answer:

Damm [24]4 years ago

3 0

Answer:

the winning candidate needs about more than a 2 percent to win the election

Step-by-step explanation:

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2 years ago

Find two fractions with a product between 10 and 11. SHOW YOUR WORK

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3 years ago

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Marita drives a total of 1,456 miles during her vacation. She drives at an average speed of 52 miles per hour. For how many hour

Cerrena [4.2K]

Answer:

28 hours

Step-by-step explanation: you divide 1,456 by 52

52 goes into 145 2 times which is 104, then subtract 104 from 145 to get 41, next bring down the 6 from 1,456 to 41 to make it 416 which 52 goes into 8 perfectly. to make the answer 28

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3 years ago

The following data represent the age (in weeks) at which 10 randomly selected babies crawled for the first time. 43, 44, 42, 31,

Studentka2010 [4]

Answer:

$42-1.833\frac{6.325}{\sqrt{10}}=38.334$

$42+1.833\frac{6.325}{\sqrt{10}}=45.666$

The 90% confidence interval is given by $38.334 \leq \mu \leq 45.666$

Step-by-step explanation:

Notation

$\bar X$ represent the sample mean

$\mu$ population mean (variable of interest)

s represent the sample standard deviation

n represent the sample size

Confidence interval

The confidence interval for the mean is given by the following formula:

$\bar X \pm t_{\alpha/2}\frac{s}{\sqrt{n}}$ (1)

In order to calculate the mean and the sample deviation we can use the following formulas:

$\bar X= \sum_{i=1}^n \frac{x_i}{n}$ (2)

$s=\sqrt{\frac{\sum_{i=1}^n (x_i-\bar X)}{n-1}}$ (3)

The mean calculated for this case is $\bar X=42$

The sample deviation calculated $s=6.325$

The degrees of freedom are given by:

$df=n-1=10-1=9$

The Confidence level is 0.90 or 90%, the significance is $\alpha=0.1$ and $\alpha/2 =0.05$ , and the critical value would be $t_{\alpha/2}=1.833$

Replacing we got:

$42-1.833\frac{6.325}{\sqrt{10}}=38.334$

$42+1.833\frac{6.325}{\sqrt{10}}=45.666$

The 90% confidence interval is given by $38.334 \leq \mu \leq 45.666$

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4 years ago

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vova2212 [387]

GURL IM STUCK ON THAT TOO Step-by-step explanation:

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3 years ago

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