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Schach [20]
3 years ago
7

The student government at the local middle school surveyed students to help plan the end-of-year party. For the first sample, th

ey surveyed every other person at sports practice after school. For the second sample, they surveyed every fifth person entering the cafeteria where all students eat. Which statement about the samples is true?
Mathematics
1 answer:
aleksandr82 [10.1K]3 years ago
6 0

Answer:

Explained below.

Step-by-step explanation:

Convenience sampling is a kind of non-probability-sampling (i.e. all items doesn’t have an equivalent chance of being selected), which doesn’t comprises of random collection of items. Convenience sampling is where we take in items which are easy to reach.  This sort of sampling technique results in a biased sample.

Systematic sampling is a kind of probability sampling method in which individuals from a larger population are nominated according to a random initial point and a static, periodic interval. If the individual <em>k</em> is selected as the first sample then the sample space consists of every <em>k</em>th individual.

In this case the first sample is an example of convenience sample and the second is a systematic sample.

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Steel Factory Workers Ages
igor_vitrenko [27]

Solution: We are given the population mean =42

Now, in order to find which shift's mean is closest to population mean, we will find the mean of each shift.

The mean of shift 1 is:

Mean=\frac{18+25+56+42+29+38+54+47+35+30}{10}=\frac{374}{10}=37.4

The mean of shift 2 is:

Mean=\frac{23+19+50+49+67+34+30+59+40+33&#10;}{10}=\frac{404}{10}=40.4

The mean of shift 3 is:

Mean=\frac{19+22+24+40+45+29+33+29+39+59  }{10}=\frac{339}{10}=33.9

The mean of shift 4 is:

Mean=\frac{21+23+25+40+35+19+70+40+22+23  }{10}=\frac{318}{10}=31.8

We clearly see the mean of shift 2 is close to the population mean. Hence the option B) Shift 2 is correct.

7 0
3 years ago
Read 2 more answers
1.Which of the following is equivalent to 0.00451
Finger [1]

Answer:

1)4.51×10^-3

2) .00632

Step-by-step explanation:

1.Which of the following is equivalent to 0.00451?

= \frac{451}{100000}

=\frac{4.51}{1000}

=\frac{4.51}{10^3}

= 4.51×10^-3

Therefore the answer is (a)

===================================================================

Which of the following is equivalent to 6.32 x 10-*3?

In order to find the answer to this question you can just put the notation into standard form which means they will be equivalent to each other.

The exponent is negative so you move to the left:

6.32=.00632

=.00632

Therefore 6.32*10^-3 is equivalent too (c) .00632

4 0
3 years ago
Read 2 more answers
The university is on a bearing of 050 degrees from the stadium and 300 degrees from the hospital. Mark the position of the unive
Licemer1 [7]

Answer:

Check Explanation

Step-by-step explanation:

The map isn't available, but, one can draw this bearings with the descriptions given

Angles for bearings are usually drawn, reading from the north direction.

A sketch of the described bearings and locations of the stadium, university and the hospital is presented in the attached image to this question.

For the sketch on the map.

On The map, draw a four-cardinal points' cross at the stadium draw a line from the bearing 050° from the stadium's four cardinal points' cross. Leave the line as it is.

Then, draw another four cardinal points' cross at the hospital and draw a line from the bearing 300° from the hospital's four cardinal points' cross.

Wherever the line from the hospital meets the line from the stadium, is where the University is located.

Hope this Helps!!!!

6 0
3 years ago
sam's driving test has 15 questions and he got 13 correct. Schuler's driving test only has 12 questions and she got 10 correct.
Murljashka [212]

Sam had the better score

To compare their scores we require to convert them into percentages

Express as a fraction and multiply by 100%

\frac{13}{15} × 100% = 86.7% ( to 1 dec. place )

\frac{10}{12} × 100% = 83.3% ( to 1 dec. place )


8 0
3 years ago
. Solve the system of equations using substitution. 3y = –x + 2 y = –x + 9 (3, 6) (20, –4) (–1, 8) (10, –1)
fiasKO [112]

Answer:

when x=25/2 and y= -7/2

5 0
4 years ago
Read 2 more answers
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