I need help PLZ!

A sample of 8 buttons is randomly selected and the following diameters are measured in inches. Give a point estimate for the pop

kenny6666 [7]

Answer:

$\bar X= \frac{1.83+1.85+1.79+1.73+1.69+1.74+1.76+1.70}{8}= 1.76125$

Now we can estimate the population variance with the sample variance given by:

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

And replacing we got:

$s^2 = 0.0033839$

And the estimator for the population deviation $\sigma$ is given by :

$\hat \sigma = \sqrt{s^2}= \sqrt{0.0033839}= 0.058172$

Step-by-step explanation:

For this case we have the following data given:

1.83,1.85,1.79,1.73,1.69,1.74,1.76,1.70

First we need to calculate the mean with the following formula:

$\bar X= \frac{\sum_{i=1}^n X_i}{n}$

And replacing we got:

$\bar X= \frac{1.83+1.85+1.79+1.73+1.69+1.74+1.76+1.70}{8}= 1.76125$

Now we can estimate the population variance with the sample variance given by:

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

And replacing we got:

$s^2 = 0.0033839$

And the estimator for the population deviation $\sigma$ is given by :

$\hat \sigma = \sqrt{s^2}= \sqrt{0.0033839}= 0.058172$

7 0

4 years ago

Chip and Manu are at a western movie. The movie starts at 11:20 AM and ends at 1:32 PM. How long is the movie?

adelina 88 [10]

Answer:

2 hours and 12minutes

Step-by-step explanation:

11 to 1 is 2 hours and 32-20is 12

7 0

2 years ago

1. Suppose you have a variable X~N(8, 1.5). What is the probability that you have values between (6.5, 9.5)

Natalija [7]

Answer:

0.6826 = 68.26% probability that you have values in this interval.

Step-by-step explanation:

Normal Probability Distribution

Problems of normal distributions can be solved using the z-score formula.

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

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

The Z-score 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. This p-value is the probability that the value of the measure is smaller than X, that is, the percentile of X. Subtracting 1 by the p-value, we get the probability that the value of the measure is greater than X.

X~N(8, 1.5)

This means that $\mu = 8, \sigma = 1.5$

What is the probability that you have values between (6.5, 9.5)?

This is the p-value of Z when X = 9.5 subtracted by the p-value of Z when X = 6.5. So

X = 9.5

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

$Z = \frac{9.5 - 8}{1.5}$

$Z = 1$

$Z = 1$ has a p-value of 0.8413.

X = 6.5

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

$Z = \frac{6.5 - 8}{1.5}$

$Z = -1$

$Z = -1$ has a p-value of 0.1587

0.8413 - 0.1587 = 0.6826

0.6826 = 68.26% probability that you have values in this interval.

7 0

3 years ago

Simplifying Radicals: √200. show work. please and thank you!

Tema [17]

Simplify Radicals of √200

Rewrite 200 as 10² *2

Factor 100 out of 200
√100(2)
Rewrite 100 as 10²
Pull terms out from under the radical.
10√2

The result can be written in both exact and decimal forms.
Exact Form
10√2 is your Answer
Decimal Form
14.14213562....

3 0

4 years ago

I need help please!:D

Elena-2011 [213]

Answer:

߷߷߷߷߷߷߷߷߷߷߷߷߷߷߷߷߷߷߷߷߷߷߷߷߷߷߷߷߷߷߷߷߷߷߷߷߷߷߷߷߷߷߷߷߷߷߷߷߷߷߷߷߷߷߷߷߷߷߷߷߷߷߷߷߷߷߷߷߷߷߷߷߷߷߷߷߷߷߷߷߷߷߷߷߷߷߷߷߷߷߷߷߷߷߷߷߷߷߷߷߷߷߷߷߷߷߷߷߷߷߷߷߷߷߷߷߷߷߷߷߷߷߷߷߷߷߷߷߷߷߷߷߷߷߷߷߷߷߷߷߷߷߷߷߷߷߷߷߷߷߷߷߷߷߷߷߷߷߷߷߷߷߷߷߷߷߷߷߷߷߷߷߷߷߷߷߷߷߷߷߷߷߷߷߷߷߷߷߷ i will k ill u

Step-by-step explanation:

5 0

3 years ago

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