PSYC 2016 10/3

What's your name?

What has been the highlight of your day today? :)

How are you feeling about PSYC 2016 right now?

• Great!

• Good

• Okay

• Not Great

Is a population distribution typically accessible?

• Yes

• No

• Sometimes

• Always

Answer explanation

A population distribution is not typically accessible because it often involves sensitive or private data that may not be publicly available. Therefore, the correct answer is 'No'.

What is the first step in locating the probability of obtaining a sample mean?

• Locate the z score in the unit normal table

• Transform a sample mean into a z score

• Calculate the standard deviation

• Find the mean of the sample

Answer explanation

The first step in locating the proportion of obtaining a sample mean is to transform the sample mean into a z score. This allows you to standardize the sample mean for comparison against the normal distribution.

Which of the following is NOT a step in locating the probability of selecting a sample mean?

• Transform a sample mean into a z score

• Locate the corresponding proportion in the unit normal table

• Calculate the median

• Determine the sample size

Answer explanation

Calculating the median is not a step in locating the proportion of a sample mean. The correct steps involve transforming the sample mean into a z score, determining the sample size, and locating the corresponding proportion.

What is used to describe the variability of data?

• Standard deviation

• Z-scores

• Sampling distribution

• Mean

Answer explanation

Standard deviation measures the amount of variation or dispersion in a set of values. It quantifies how much the data points deviate from the mean, making it the correct choice to describe data variability.

What is the purpose of using z-scores in data analysis?

• To encrypt data

• To compare results

• To visualize data

• To mine data

Answer explanation

Z-scores standardize data points, allowing for comparison across different datasets or distributions. This helps identify how far a value is from the mean, making 'To compare results' the correct choice.

What is described by central tendency?

• Data encryption

• Average or typical value

• Data mining

• Data visualization

Answer explanation

Central tendency refers to the average or typical value of a dataset, summarizing the data's central point. This makes 'Average or typical value' the correct choice, as it directly defines central tendency.

Which concept is related to sampling distribution?

• Data encryption

• Sample means

• Data mining

• Data visualization

Answer explanation

The concept of sampling distribution is closely related to sample means, as it describes the distribution of sample means from a population. This is fundamental in statistics for making inferences about population parameters.