Question

True or False 1 point each) (Correct the ones that are false, carn an extra credit point for each.) The statistical method appropriate for summarizing data depends on whether the data are categorical or quantitative. Whenever a dataset contains extreme values, the mean is preferred over the median as a mcasure ot central location. 1. 2. 3. The recommended number of classes for a frequency distribution is 8. 4. A ste and leaf display can show rank order and shape of a distribution of data 5. 6. For any discrete probability fuiction the following must be satisfied Chcbyshev's Theorem and the Empirical Rulc predict the same proportion of data valucs will fall within 2 standard deviations from the mean. fx) 2 0 and 2fix)-1. 7. A z score measures how far a particular value is from the mean of the data set. 8. If we define x to be the number of successes occurring in a binomial experiment of n trials then x is a discrete random variable with a probability distribution for values , 1,2,... n 9. Outliers in a dataset can be detected using either or both the z score or quartile 10. A public opinion poll is an example of an observational study 11. The coefficient of variation measures the standard deviation relative to the mean. 12. A pie chart is a graphical display presenting frequency, relative frequency, or percent frequency distributions for categorical data. 13. The point estimate of a population paramcter is the corresponding sample statistic 14. The difference between stratified sampling and cluster sampling is that with stratified sarripling ล simple random, sample s taken from each strat urn but with cluster sarripling a simple random sample of the clusters is chosen and all elements in the chosen clusters form the samplc, 15. When the sample size is increased, the standard error of the mean also is increased. 16. The purpose of an interval estimate is to provide information about how close a point estimate, i.e. sample statistic, is to the population parameter 17. The expected value of the sample mean is the population mean.

Answer 1

Answers for following questions are as follows :

1. True
2. False ( Median is better in case of extreme values)
3. False
4. True
5. True