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3 years ago

A sample of 4 is selected from a lot of 20 piston rings. How many different sample combinations are possible?

Mathematics

1 answer:

Sunny_sXe [5.5K]3 years ago

3 0

Answer:

Step-by-step explanation:

Sample of 4 is selected: _ _ _ _

Number of possibilities for first selection: 20

Number of possibilities for second selection: 19 (because one was already chosen)

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A veterinarian wants to know if pit bulls or golden retrievers have a higher incidence of tooth decay at the age of three. The v

BigorU [14]

Answer: B) [-0.0332,0.1332]

Step-by-step explanation: <u>Confidence</u> <u>Interval</u> is an interval where we can be a percentage sure the true mean is.

The confidence interval for a difference in population proportion is calculated following these steps:

First, let's find population proportion for each population:

$p_{1}=\frac{30}{120}=0.25$

$p_{2}=\frac{32}{160}=0.2$

Second, calculate standard deviation for each proportion:

$\sigma_{1}=\sqrt{\frac{0.25(0.75)}{120} } = 0.0395$

$\sigma_{2}=\sqrt{\frac{0.2(0.8)}{160} } = 0.0316$

Now, we calculate standard error for difference:

$SE=\sqrt{\sigma_{1}^{2}+\sigma_{2}^{2}}$

$SE=\sqrt{0.0395^{2}+0.0316^{2}}$

SE = 0.0505

The z-score for a 90% CI is 1.645.

Then, confidence interval is

$p_{1}-p_{2}$ ± z-score.SE

$0.25-0.2$ ± $1.645(0.0505)$

0.05 ± 0.0831

The limits of this interval are:

inferior: 0.05 - 0.0831 = $-0.0332$

superior: 0.05 + 0.0831 = 0.1332

The 90% confidence interval for the difference in the population proportion of pit pulls and golden retrievers is $[-0.0332,0.1332]$ .

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3 years ago

Carol climbed up 25.9 feet, came down 14.3 feet, and then went back up 10 feet. You calculate how high she is. How can you check

ioda

I think the answer is convert all decimals to fractions.

Hope this helps!!!!!

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3 years ago

A container is leaking 0.42 liters of solution each hour. What is the overall change after 5 hours?

OLga [1]

Answer:

2.3 liters leaked

Step-by-step explanation:

0.42 * 5

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3 years ago

Suppose the amount of chickens varies directly with the pounds of corn needed. Billy

Anna11 [10]

Answer:

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Step-by-step explanation:

The chickens be hungry doe.

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2 years ago

Can anyone help me with #14?

liraira [26]

Number of students on a sports team

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