1. What do we call the standard deviation of a sampling distribution?

The standard error

The variance

The unbiased mode

The mean

2. How can youdecrease the standard error of the sample mean when carrying out a scientific study?

You may achieve this goal by increasing your sample size because, as the sample size increases, according to both practice and theory, we get closer and closer to the parameter(s) we are trying to estimate.

you can decrease the maximal error

you can make sure your sample mean is very small

You should discard all the observations that will make the deviations from the mean larger.

3. This question has multiple answers

Of the following, pick thethree conditions that will insure our sampling distribution of a sample mean is nearly normally distributed.

Ensure the sample observations are independent, which means that the probability that one particular observation is recorded does not affect the probability that another observation be recorded. In this context, this is choosing each sample randomly.

The sample size, n should be greater than or equal to 30. In fact, the larger the sample size, the closer we get to normality.

By working with a population known to be very skewed; in other words, by working with a population that are relatively normal.

By creating a frequency table in such a way that the class widths are distributed to form a fairly normal histogram.

4. This question has multiple answers

How can we ensure that a point estimate is as unbiased as possible?

We can be ensuring our sample is as randomized as possible.

We can be ensuring that the sequence of questions we ask, does not prime the person surveyed if we are interested in measuring a point estimate. For example, if we are interested in knowing whether a person believes climate change is real, we ensure unbiased results by simply asking, "Is climate change real"?

We can be by working with two or more samples. It can be done in many ways. Ideally, we will send two individuals to collect data on the sample population, then, estimate our parameter for each sample. We can then compare our answers and see how much they differ. If they do not differ much, we now can assume we collected samples as unbiasedly as we could. If they differ significantly, it may be the case that among other issues, we measured incorrectly, we observed outliers, or we were biased in our collection.

We can be ensuring that the person we survey is primed if we are interested in measuring their behavior of feeling toward our point estimate. For example, if we want to measure whether explaining to a person, scientifically

5. This question has multiple answers

Please take a few minutes to watch the following video:

https://www.youtube.com/watch?v=IIWlatQt4KE

Determine which statements are correct, based on the video.

Per the video, the company is correct in telling customers the exact probability they belong to a number of ethnicities.

If the video is correct, what the company should say is,'we are x percent confident,that your test, is one that captures the true proportionsof your ethnic makeup.

If the video is correct, the test is problematic because the DNA variability they use for the test is less than 0.1%

Furthermore, the probability that the people who are sending DNA are mostly composed of the wealthiest people around the planet is high. For, it is quite likely their sample is not representative of the world population.

We should not worry about the methodology of the test, as the test reassures our notions of our true ethnic makeup