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SIZIF [17.4K]
2 years ago
13

What the surface area

Mathematics
1 answer:
RideAnS [48]2 years ago
8 0
The surface area of what?
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In a study to establish the absolute threshold of hearing, 80 male college freshmen were each seated in a soundproof room and a
Norma-Jean [14]

Answer:

Step-by-step explanation:

Hello!

To study the threshold of hering the researcher took a random sample of 80 male college freshmen.

The students underwent an audiometry test where a tome was played and they had to press a button when they detected it.  The researcher recorded the lowest stimulus level at which the tone was detected obtaining a sample mean of X[bar]= 22.2 dB and a standard deviation of S= 2.1 dB

To estimate the population mean, since we don't have information about the variable distribution but the sample size is greater than 30, you can use the approximation of the standard normal distribution:

X[bar] ± Z_{1-\alpha /2} * \frac{S}{\sqrt{n} }

Where the semiamplitude or margin of error of the interval is:

d= Z_{1-\alpha /2} * \frac{S}{\sqrt{n} }

Using a 95% level Z_{0.975}= 1.965

d= 1.965 * \frac{2.1}{\sqrt{80} }

d= 0.46

The point estimate of the population mean of the threshold of hearing for male college freshmen is X[bar]= 22.2 db

And the estimation using a 95%CI is [21.74;22.66]

I hope this helps!

8 0
3 years ago
James has just sold his motorbike for £1,890. He bought the motorbike for £2,700. What was his percentage loss? %
Usimov [2.4K]
£2.700 - £1890 = £810

<span>£ (money) -------------- percentage (%)
</span>2.700 -------------------- 100
810 ----------------------- x

2700*x = 810*100
2700x = 81000
x =  \frac{81000}{2700}
\boxed{x = 30}

Answer: 
Percentage loss = 30%
6 0
2 years ago
22.700 nearest hundredth/6413202/1c463fd9?utm_source=registration
Vesnalui [34]
You already have the answer in the question
4 0
3 years ago
Whats half of 30 i need a answer
Flura [38]

Answer:

15

Step-by-step explanation:

30 / 2 = 15

4 0
3 years ago
Read 2 more answers
F(x)=17-5x at x=8 Help me plz​
OLEGan [10]
The derivative is -5
4 0
3 years ago
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