analyzing sample data

Module Two: Sampling and Experimentation - Overview of methods of data collection: Census Sample survey Experiment Observational study Planning and conducting surveys: Characteristics of a well-designed and well-conducted survey Populations, samples, and rand..

Select the wrong statement(s). I. Two major branches of statistics are statistics and probability. II. A group of all subjects under study is called a population. III. Statistics is the science of conducting studies to collect, organize, summarize, analyze and draw conclusions from d..

Find the F-test value for testing the difference between two population variances. The data shows the two samples from each of the populations. => 1.11 or 0.63 or 2.38 or 2.16..

Comparing center and spread: within group, between group variation Comparing clusters and gaps Comparing outliners and other unusual features Comparing shapes Exploring bivariate data: Analyzing patterns in scatterplots Correlation and linearity Least-squares r..

Check whether the population variances differ significantly at 90% confidence. Also find out F-test value. The data relating to two samples from those populations are shown in the table. Sample size Sample variance 25 7 16 5.6 => 2.11, do not differ or 2.29, ..

A sample of the number of admissions to a psychiatric ward at a local hospital during a certain period was as follows: 22, 30, 21, 27, 31, 36, 20, 28, 25, 33, 30, 21, 38, 32, 35, 26, 19, 43, 30, 34, 27 and 41. Which stem and leaf plot represents the data? => Figure 3 or both Fig..

The data obtained from a sample survey of purchasers of the car yielded the results as shown. At α = 0.01, find the chi-square test value. Does the gender determine the type of car purchased? => 11.3, yes or 7.43, yes or 7.43, no or 11.3, no..

A statistician analyzed and concluded that the mean time spent by the student per day on studies at home is more than 1.6 hours. The time spent at home on studies by a random sample of 20 students (time spent per day on reading or doing homework) in hours are as follows: 2 1.7 3..

The manager of a company estimated that the average typing speed of the data entry operators is above 60 words per minute with a standard deviation of 3.6 words per minute. Average typing speed of a sample of 40 operators was observed as 61.5 words per minute. Find p -value for ..

Which of the following statement(s) is/are true? I. The population mean is represented by the Roman letter X ‾ . The sample mean is represented by the Greek letter μ . II. The measures that determine the spread of the data values are called measures of dispersion. III..