the people in the 18) 18) The Harrisburg Planning Department is trying to determ
ID: 3282543 • Letter: T
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the people in the 18) 18) The Harrisburg Planning Department is trying to determine what percent of so, the city want to spend public funds to remodel the playground in the city's park. To do department decides to conduct a survey. A professional interviewer city's shopping plaza between the hours of 9 a.m. and 4 p.m on a Wednesday people who were asked to take the survey, 350 of them agreed to complete it. The results this survey are unreliable primarily because A) there was no control group B) of sampling variability C) they were not a stratified survey D) of selection bias. E) of non-response bias. surveys people at the of 19) The city of Martinsville has 10,652 registered voters. During a recent election for mayor, three 19) candidates ran for the position: Smith, Grant, and Johnston. Two months before the election all registered voters were mailed a mock ballot, asking them to indicate which candidate they planned to vote for. Of the 10,652 mock ballots mailed out, 1542 ballots were completed and returned. Results of the mock ballot indicated that 579 people would vote for Smith, 752 people would vote for Grant, and 211 would vote for Johnston. However, Smith ended up winning the actual election for mayor. The results of this pre-election survey are unreliable primarily because A) they were not a stratified survey. B) of sampling variability. C) of non-response bias. D) there was no control group. E) of selection bias. 20) A method of sampling in which the population is broken up into categories and the members 20 of the sample are chosen randomly from within some group of randomly selected categories is called A) randomized controlled sampling. B) quota sampling. C) simple random sampling. D) stratified sampling E) none of these 21) Any type of numerical information about a population obtained from a sample is called A) a clinical study B) a controlled study C) a parameter D) a statistic. E) none of these 22) Suppose you are conducting a survey for a company who wants to know what Walmart 22) employees think of their wages. You decide to stand outside your local Walmart and survey employees as they walk into or out of the building. What type of sampling is being used? A) capture-recapture B) simple random sampling C) stratified sampling D) quota sampling E) convenience samplingExplanation / Answer
18) The results of this survey are unreliable because of selection bias as our intended population is the people who goes to park in the evening
19) This survey suffers from non response bias as most people did not return the mock ballots
20) stratified sampling is the sampling in which the population is broken into categories and members of the samples are chosen randomly
21)numerical information obtained from the population of the samples is called as statistics
22) it is a convenience sampling and samplings are chosen because they are convenient.it gives preliminary estimate of the results
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