PROBSTATS 11 - Quiz 1 (Finals)

The theater hall offers tickets in three zones: orchestra, mezzanine and balcony.

The tickets in the balcony zone are least expensive while tickets in the orchestra zone are most expensive. Directors of the venue want to survey approximately 150 guests at the next event about their opinions on the schedule of shows in the upcoming season.

Why might the directors choose a systematic random sample approach than simple random sampling?

• A random sampling must choose to lessen the time of getting the response of the survey than having a systematic sampling approach.

• A systematic sampling chooses some guests of all ages, so they will be more likely to get a representative sample.

• A systematic sampling can save time by selecting guests as they enter rather than looking for guests selected in a simple random sample.

• A systematic-random sampling reduces the likelihood of getting disproportionate numbers of guests from any given zone.

Identify the population and sample in the following situations:

A city council member wanted to know how her constituents felt about a planned rezoning. She randomly selected 75 names from the city phone directory and conducted a phone survey.

• The population is everyone listed in the city phone directory; the sample is the 75 people who were selected.

• The population is residents of the city; the sample is the registered voters in the city.

• The population is registered voters in the city; the sample is everyone listed in the city phone directory.

• The population is everyone listed in the city phone directory; the sample is registered voters in the city.

RB wants to know whether the food he serves in his restaurant is within a safe range of temperatures. He randomly selects 17 entrees and measures their temperatures just before he serves them to his customers. Identify the population and sample in this setting.

• The population is all of the entrees RB serves; the sample is the 70 selected entrees.

• The sample is the entrees that are a safe temperature; the population is the 17 selected entrees.

• The sample is the 17 selected entrees; the population is all of the entrees RB serves.

• The population is all of the hot entrees RB serves; the sample is the entrees that are a safe temperature.

What type of sample is this?

Kuya Kim asks the Kapuso fans to visit his facebook page Kuya Kim Atienza and answer his online survey.

• Simple Random Sample

• None of the Choices

• Systematic Random Sample

• Cluster Random Sample

Daniel works in a factory. He was appointed as the chief of quality control. As his sample for the day, he only chooses the first 12 items he sees. What kind of sample is it?

• None of the Choices

• Simple Random Sample

• Systematic Random Sample

• Multi-stage Sampling

What type of sample is this?

A school chooses 5 randomly selected athletes from each of its sports teams to participate in a survey about athletics at the school.

• None of the Choices

• Simple Random Sampling

• Stratified random Sampling

• Area Sampling

A survey company was trying to see if people in a state thought the pollution was too high. Which choice best represents a population?

• Every selection of people from each

  city in the state.

• A selection of people who live in

  small towns.

• Every person who owns more than 3 cars.

• None of the choices

Which choice best represents a sample?

A handsome musician wanted to see what people who bought his last album thought about the songs.

• Every person who bought the

  album.

• A selection of people who didn't

  want to buy the album.

• A selection of 3,227 people who

  bought the album.

• 219 girls who bought the album

Which of the following is NOT true about statistic?

• Variables used for the statistic are usually lowercase Latin letters, several with diacritical marks.

• An example of a statistic would be 2,000 high school students from the midwest.

• A statistic is a sample taken from whatever the parameter is. This means it’s a subset of whatever group of people, countries, organizations, animals, objects, or plants you’re studying.

• A statistic is the selection of a population from a sample.

Which of the following is an example of PARAMETER?

I . Proportion of 2000 randomly sampled participants that support the death penalty.

II. The standard deviation of weekly allowance of all senior high school students in Christian Ecclesiastical School.

III. Median of the weights of onions from one farm.

IV. Mean screen time of all high school students in the Philippines.

• II only

• II and IV

• II and III

• II, III and IV