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mylen [45]
3 years ago
12

The quality control officer at a manufacturing plant needs to determine what percentage of items in a batch are defective. The f

ollowing are different sampling techniques that could be used by the officer. Classify each as simple random sample, stratified sample, systematic sample, cluster sample, or convenience sample.
A. The officer lists all of the batches in a given month. The number of defective items is counted in randomly selected batches.
B. The officer takes the first 10 batches and counts the number of defective items.
C. The officer groups the batches made in a month into which shift they are made. The number of defective items is counted in randomly selected batches in each shift.
D. The officer chooses every 15th batch off the line and counts the number of defective items in each chosen batch.
E. The officer divides the batches made in a month into which day they were made. Then certain days are picked and every batch made that day is counted to determine the number of defective items.
Mathematics
1 answer:
artcher [175]3 years ago
8 0

Answer:

A. Simple Random Sampling

B. Cluster Sampling

C. Convenience Sampling

D. Systematic Sampling

E. Stratified Sampling

Step-by-step explanation:

Simple Random Sampling is the sampling when samples are chosen randomly, where each unit has an equal chance of being selected in a sample.

If the population is divided into a different group called cluster and clusters are selected as a sample then it is Cluster Sampling.

In Convenience sampling, observers collect the sample as his\her convenience.

In Systematic Sampling sample is chosen by some criteria like he\she is taken every 10th unit as a sample from the population.

In Stratified Sampling population is divided into several groups such that within the group it is homogeneous and between the group it is heterogeneous. And now a selection of each stratum and unit has an equal chance of selection.

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Zepler [3.9K]

Answer:

1. Number of boys in A is 52028.

2. Number of girls in B is 46510.

3. Town B has more number of girls.

Step-by-step explanation:

1. 95364 - 43336 = 52028

2. 100005-53495=46510

3. 43336 (A < B)

5 0
3 years ago
Which number line models the sum of 1+(−2) correctly?
Tomtit [17]

Answer:

option 3

Step-by-step explanation:

you add one, so the arrow goes one space to 1

since youre sutracting -2, the arrow goes ack two spaces to -1

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3 years ago
What is the term of a 7-term geometric series if the first term is -11 the last term is -45,056 and the common ratio is -4
shutvik [7]
I assume you mean to ask how to find the sum of the seven terms?

You have

a_2=ra_1
a_3=ra_2=r^2a_1
a_4=ra_3=r^3a_1
...
a_7=ra_6=r^6a_1

So the sum is

a_1+ra_1+r^2a_1+\cdots+r^6a_1=a_1(1+r+r^2+\cdots+r^6)=a_1\times\dfrac{1-r^7}{1-r}

You know that a_1=-11 and r=-4, so the sum is equal to

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3 years ago
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ValentinkaMS [17]
Survive because your persevering through a tough time
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3 years ago
Read 2 more answers
Ten times a number a added to three times a second number b divided by a third number c.​
pentagon [3]

Answer:

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Step-by-step explanation:

let the first number be a

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10×a +3×b ÷c÷3

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