Television page 99
Did you hear about Christina Applegate?
SPT's Todd Miller to Head Up Celestial Tiger Entertainment
Tricia Helfer To Star In TNT's Scent Of The Missing
Demi Lovato Gets Episode Of Disney's Shake It Up Pulled
TCA: 'Desperate Housewives' Creator Shoots Down Idea of Feature Film
An Airplane Is The Secret To Great Coverage During NHL's Winter Classic Game
The Farrelly Brothers To Produce A Comedy For Showtime
California Extends $100 Million Tax Credit Bill
I need help for these questions I need to know them for a test it would be great if someone guides me on any of these question which they know, please they are very imp I tried them but I got confused many times, so please all the help will be appreciated. 1. A letter to the editor of Organic Gardening magazine (August 1980) said, “Today I noticed about eight stinkbugs on the sunflower stalks. Immediately I checked my okra, for I was sure that they’d be under attack. There wasn’t one stinkbug on them. I’d never read that stinkbugs are attracted to sunflowers, but I’ll surely interplant them with my okra from now on.” Explain briefly why this anecdote does not provide good evidence that sunflowers attract stinkbugs away from okra. In your explanation, suggest some factors that might account for all of the bugs being on the sunflowers. 2. A study of the effect of living in public housing on family stability and other variablesin poverty-level households was carried out as follows. The researchers obtained a list of allapplicants for public housing during the previous year. Some applicants had been accepted,while others had been turned down by the housing authority. Both groups were interviewed andcompared. Was this study an experiment? Why or why not? What are the explanatory and response variables in the study 3. An experiment that claimed to show meditation lowers anxiety proceeded as follows. The experimenter interviewed the subjects and rated their level of anxiety. then the subjects were randomly assigned two groups. the experimenter taught one group was simply told to relax more. at the end of the month, the experimenter interviewed all the subjects again and rated their anxiety level. the meditation group now had less anxiety. psychologists said that the results were suspect because the ratings were not blind. explain what this means and how lack of blindness could bias the reported result 4. Some television stations take quick polls of public opinion by announcing a questin on the air and asking viewers to call one of two telephone numbers to register their opion as "yes" or "No." Telephone companies make available "900"numbers for htis purpose. Dialing a 900 number results in a small charge to your telephone bill. One such call in polls finds that 73% of those who called are opposed to a proposed local gun control ordinance. Explain why this sampling method is biased. Is the percent of the population who oppose gun control probably higher or lower than 73% of the sample who are opposed? 5. A university has 2000 male and 500 female faculty members. This is the total population. The university wants to randomly select 50 females and 200 males for a survey, giving each faculty member a 1 in 10 chance of being chosen.This sampe design gives every unit in the population the same chance to be chosen for the sample, Is this a simple random sample (SRS)? Explain.
Here's some help for each of your questions. 1. The evidence is poor because it's too small a sample (by chance all might be on sunflowers); there might be more sunflowers than okra (increasing the likelihood that the bugs would be found on sunflowers); the sunflowers might be situated in an area more favored by stinkbugs (increasing the likelihood that the bugs would be found on sunflowers) so in general the evidence that stinkbugs prefer sunflowers is weak. 2. This study was not an experiment, it was a retrospective study. An experiment begins with subjects being assigned to a treatment (here, the treatment is public housing) but this study began later. The main explanatory variable is being in public housing and the main response variable is family stability. 3. The ratings were not 'blind' because the rater (the experimenter) knew which treatment each subject had received. As the experimenter probably had a view prior to the experiment as to the effect of meditation on anxiety, this is a source of bias. To avoid this, the rater should be someone who does not know who received what treatment. 4. There are many sources of bias: only television viewers at the time of the survey will respond; only viewers willing and able to pay to call will have their opinions counted; most likely only those particularly motivated to voice their opinion will call. In this case, it is likely that gun owners were higly motivated to oppose the proposal, so 73% probably overstates the level of opposition. 5. It is not a simple random sample, it is a stratified random sample. In a simple random sample, every member in the population would have an equal chance of being selected, so the proportion of females would almost certainly not be exactly 500/2500 (0.2). A stratifed random sample splits the population into appropriate strata (in this case male and female) then within each stratum simple random sampling is done and the samples are combined.
| Each formed person should love and understand art – the literature, painting, music, cinema. There are people who equally love books, musik , pictures, an opera, films etc. I cannot tell that I concern different displays of art equally ardently. At present priority for me is cinema. The cinema is a surprising art. The cinema is likely the lung for perception and the understanding, the most accessible art. The cinema is a fast art. If to read the book, week film viewing occupies a maximum of hour three is necessary to the average person a minimum. |
