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Naya [18.7K]
3 years ago
7

a truck company places their office phone number on the black of all of their vehicles to receive comments on how well their emp

loyees are driving. (identify the type of sampling method used.)
Mathematics
2 answers:
kolbaska11 [484]3 years ago
8 0

Answer:

Voluntary sampling

Step-by-step explanation:

In this sample, people elect to participate.  They volunteer.  That makes this a voluntary sample.

valina [46]3 years ago
6 0

Answer:

This type of sampling is known as a voluntary sampling.

Step-by-step explanation:

The voluntary sampling method is a sampling method where people are themselves interested in the survey topic. The people self elect themselves to conduct this kind of survey. For example, the reality shows asks their viewers to participate in an on-line poll.

So, this is a type of voluntary sampling method.

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Mr. Fraser will owe $4,095 at the end of the month.

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3 years ago
Suppose the time to complete a 200-meter backstroke swim for female competitive swimmers is normally distributed with a mean μ =
hammer [34]

Answer:

The swimmer must complete the 200-meter backstroke in no more than 130 seconds.

Step-by-step explanation:

Problems of normally distributed samples are solved using the z-score formula.

In a set with mean \mu and standard deviation \sigma, the zscore of a measure X is given by:

Z = \frac{X - \mu}{\sigma}

The Z-score measures how many standard deviations the measure is from the mean. After finding the Z-score, we look at the z-score table and find the p-value associated with this z-score. This p-value is the probability that the value of the measure is smaller than X, that is, the percentile of X. Subtracting 1 by the pvalue, we get the probability that the value of the measure is greater than X.

In this problem, we have that:

\mu = 141, \sigma = 7

Fastest 6%

At most in the 6th percentile, that is, at most a value of X when Z has a pvalue of 0.07. So we have to find X when Z = -1.555.

Z = \frac{X - \mu}{\sigma}

-1.555 = \frac{X - 141}{7}

X - 141 = -1.555*7

X = 130

The swimmer must complete the 200-meter backstroke in no more than 130 seconds.

3 0
3 years ago
MK and ML are tangent to circle J. If MK = 6x – 15 and ML = 2x + 9, find x. * am i right?? * --> provide details if i'm wrong
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Answer:

Step-by-step explanation:

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0.4 * x = 68
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check:

0.4 * 170 = 68
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Step-by-step explanation:

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