1. Medians can be used as a measure of central tendency in what type(s) of data?
ID: 3226371 • Letter: 1
Question
1. Medians can be used as a measure of central tendency in what type(s) of data?
nominal, ratio, interval, ordinal
2.The p-value represents the probability of a relationship occurring by chance if the null hypothesis is true. Therefore the statistical test itself assumes that the null is true even if it in actuality may not be true.
true or false
3.The standard error of the mean and the standard deviation of a sample are the same thing.
true or false
4. When is a result considered to be "statistically significant"?
when the alternative hypothesis is true,
when the p value is less than the significance level
when the null hypothesis is true
when the p value is greater than the significance level
5. What proportion of a normal distribution is within two standard deviations of the mean?
95, 68, 50,75
when the alternative hypothesis is true,
when the p value is less than the significance level
when the null hypothesis is true
when the p value is greater than the significance level
Explanation / Answer
(1)ordinal , median are used in qualitative data and for qualitative data ordinal scale is used.
(2)true, in statistical test we want to test null is true against the null is not true
(3) true,
(4) when the p value is less than the significance level
(5)95, P(-2<Z<2)=P(Z<2)-P(Z<-2)=0.97-0.02=0.95
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