research question hierarchy

A study that involves no researcher intervention is called __________. => an experimental study or a non involvement study or a quasi-experimental study or an observational study..

A researcher wishes to estimate, with 99% confidence the proportion of executives who have a bank account in 'ABC' bank. A previous study shows that 38% of those interviewed had a bank account in that bank. The researcher wishes to be accurate within 2% of the true proportion. F..

What sampling method was used by a researcher who divided subjects into two groups according to gender and then selected members from each group for her sample? => cluster or stratified or random or systematic..

True or False? I. If a research hypothesis is rejected at 5% level, then it is also rejected at 10% level. II. If a reserch hypothesis is rejected at 5% level, then it is also rejected at 1% level. => I is false, II is true or both I and II are true or both I and II are false or I is true..

The report of a municipal corporation states that the average monthly electricity bill of a household in the city is more than $73. To test this report, a researcher selected a sample of 100 residential electricity bills and found the mean as $74.50 with a standard deviation as $15. At &a..

The average time a person spoke over the cell phone while driving in a day was reported as more than 14.5 minutes. A researcher wished to test this report. He selected a sample of 100 persons for his study and found that the mean was 15.6 minutes. At α = 0.01, what will be the concl..

A researcher claims that the variance of temperatures recorded at different locations of 2 cities differ in a particular month. If the variance of temperature recorded at 25 locations of city 1 in that month is 32.5 and that of 16 locations of city 2 is 39, then find the F-value and check..

A medical researcher wants to know the relationship among a person's age ( x 1 ), hours of exercise ( x 2 ) and the systolic blood pressure (in mmHg) ( y ). He has collected the data of a sample of 8 persons for the research. Find (i) R 2 and (ii) the adjusted R 2 . => (i) 0.916..

A survey reports that more than 20% of the families in the population own one child under 18 years of age. To test this report, a researcher selected a sample of 200 families and found that 46 of them own one child under the age of 18 years. At α = 0.05, is there enough evidence to ..

A researcher surveyed 200 randomly selected persons in four different areas of the city and asked whether they had seen at least 3 wonders of the world. The results are shown here. At α = 0.01, find the chi-square test value. Can it be concluded that the proportions of persons who h..