Review of Dat-N-Stat (part 2)

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The second review of the data management and statistics content that will be relevant for this class.

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Wendy

Austria

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Review of Dat-N-Stat (part 2)


Review of Dat-N-Stat (part 2)Version en ligne The second review of the data management and statistics content that will be relevant for this class. par Wendy 1 Which of the following is most affected by extreme values or outliers? a Mean b Median c Mode 2 If a dataset is skewed due to a few extreme values, which measure of central tendency gives the best representation of the “typical” value? a Mean b Median c Mode 3 Which measure of central tendency identifies the most frequently occurring value in a dataset? a Mean b Median c Mode 4 What does absolute frequency measure? a The average number of values in a dataset b The percentage of respondents choosing a certain answer c The number of times a specific value appears d The middle value in a sorted dataset 5 If 10 students out of 30 wear glasses, what is the relative frequency of “students with glasses”? a 0.10 b 10 c 30 d 33% 6 In a normal distribution, what percentage of data lies within one standard deviation of the mean? a 50% b 68% c 95% d 99.7% 7 What is the purpose of inferential statistics? a To draw conclusions about a population based on sample data b To clean and organize datasets c To visualize data in charts and tables d To describe and summarize a sample 8 In general hypothesis testing (e.g., testing group differences or correlations), what does the null hypothesis (H₀) typically state? a The sample data proves a strong effect exists b There is no relationship or difference between the variables c The model fits the data well d The sample variances are equal 9 What is a Type I error? a Accepting a false null hypothesis b Rejecting a false alternative hypothesis c Rejecting a true null hypothesis d Failing to reject a false null hypothesis 10 Which of the following statements about p-values is true? a A p-value greater than 0.05 means results are statistically significant. b A p-value tells you how large your sample is. c A p-value below 0.05 suggests the results are unlikely due to chance. d P-values are only used in descriptive statistics. Explanation 1 The mean includes every data point in its calculation, so one very high or low value can skew it significantly. 2 The median is more resistant to outliers and better represents the center of a skewed distribution. 3 The mode tells you which value appears most often, such as the most common shoe size or favorite color. 4 Absolute frequency is the raw count of occurrences of a value. 5 Relative frequency = 10 ÷ 30 = 0.33 or 33%. 6 In a normal distribution, about 68% of data falls within ±1 standard deviation of the mean. 7 Inferential statistics use sample data to make generalizations about a larger population. 8 In general hypothesis testing, the null hypothesis states that there is no effect or no relationship — this is the default assumption that we test against. However, in specific statistical tests, like RMSEA or Levene’s test, the null hypothesis may take a more tailored form. 9 A Type I error means you incorrectly conclude there is an effect or difference when there isn’t. It is a “false positive.” 10 A p-value under 0.05 typically indicates statistical significance. In other words, the observed effect is unlikely to be due to chance alone.

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Review of Dat-N-Stat (part 2)

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Review of Dat-N-Stat (part 2)Version en ligne

par Wendy

Which of the following is most affected by extreme values or outliers?

If a dataset is skewed due to a few extreme values, which measure of central tendency gives the best representation of the “typical” value?

Which measure of central tendency identifies the most frequently occurring value in a dataset?

What does absolute frequency measure?

If 10 students out of 30 wear glasses, what is the relative frequency of “students with glasses”?

In a normal distribution, what percentage of data lies within one standard deviation of the mean?

What is the purpose of inferential statistics?

In general hypothesis testing (e.g., testing group differences or correlations), what does the null hypothesis (H₀) typically state?

What is a Type I error?

Which of the following statements about p-values is true?

Explanation