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ololo11 [35]
3 years ago
10

A statistics teacher has 4 periods of introductory statistics. She wants to get students’ opinions on a new homework policy. To

get a sample, the teacher randomly selects 1 period and surveys all of the students in that class. Which sampling method was used?
A.) cluster sampling
B.) simple random sampling
C.) stratified random sampling
D.) systematic random sampling
Mathematics
2 answers:
ladessa [460]3 years ago
8 0

Answer:

the answer is B

b) Simple random sampling

Radda [10]3 years ago
3 0

Answer:

Simple random sampling

Step-by-step explanation:

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A manufacturing company wants to use a sample to estimate the proportion of defective tennis balls that are produced by a machin
Kitty [74]

Answer:

The least number of tennis balls needed for the sample is 1849.

Step-by-step explanation:

The (1 - <em>α</em>) % confidence interval for population proportion is:

 CI=\hat p\pm z_{\alpha/2}\ \sqrt{\frac{\hat p(1-\hat p)}{n}}

The margin of error for this interval is:

 MOE= z_{\alpha/2}\ \sqrt{\frac{\hat p(1-\hat p)}{n}}

Assume that the proportion of all defective tennis balls is <em>p</em> = 0.50.

The information provided is:

MOE = 0.03  

Confidence level = 99%

<em>α</em> = 1%

Compute the critical value of <em>z</em> for <em>α</em> = 1% as follows:

 z_{\alpha/2}=z_{0.01/2}=z_{0.005}=2.58

*Use a <em>z</em>-table.

Compute the sample size required as follows:

 MOE= z_{\alpha/2}\ \sqrt{\frac{\hat p(1-\hat p)}{n}}

       n=[\frac{z_{\alpha/2}\times \sqrt{\hat p(1-\hat p)} }{MOE}]^{2}

          =[\frac{2.58\times \sqrt{0.50(1-0.50)} }{0.03}]^{2}\\\\=1849    

Thus, the least number of tennis balls needed for the sample is 1849.

8 0
3 years ago
Rewrite the following equation as a function of x
True [87]

Answer:

the awnser is b hope this helps

Step-by-step explanation:

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2 years ago
ron draws 16 cards from a deck of 52 cards. the deck is made up of cards of four different colors-red, blue, yellow and green. h
dlinn [17]
Assuming that the number of each colour is the same
probability of picking a green would be 1/4 since 1/4 of the cards are (i am assuming) green

1/4 of 16=4
4 0
3 years ago
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