Question

In: Math

A researcher was interested in utilities provided by city governments. The researcher randomly selected 20 counties...

A researcher was interested in utilities provided by city governments. The researcher randomly selected 20 counties from a list of all counties in the U.S. From each of these counties the researcher then contacted each city government (a total of 192) and found that 12 (6.25%) of them provided electricity to their residents. In this situation the sampling frame is

Select one:

a. the list of all counties in the U.S.

b. the 316 cities.

c. the 20 counties.

d. 6.25%.

Solutions

Expert Solution


Related Solutions

A researcher is interested in heart rates of university students. The researcher randomly selects 52 students...
A researcher is interested in heart rates of university students. The researcher randomly selects 52 students from a class they are teaching and measures the students’ heart rates. The data obtained is in the file “Heart Rates.csv”. 1. What is the target population? What is the study population? What is an individual? 2. Is this an observational study or an experiment? 3. The tools you have learned for doing statistical inference require that certain assumptions be met. Check whether these...
A researcher was interested in the effects of alcohol on attractiveness of mate selected (referred to...
A researcher was interested in the effects of alcohol on attractiveness of mate selected (referred to as the beer goggle effect). She compared the rating (by independent raters) on level of attractiveness of the partners that young people chose at a party. She compared a group before using alcohol then after using alcohol. Assessment was whether their chosen partners differed in levels of attractiveness. Higher scores indicated more attractive partners. The attractiveness of partner for each participant (measured by independent...
A mayor of a big city finds that 262 of 400 randomly selected city residents believe...
A mayor of a big city finds that 262 of 400 randomly selected city residents believe that the city should spend more money on public transportation. Use this information for a large-sample inference of the proportion of all city residents who believe that the city should be spending more. 1. What percentage of the sample members believe the city should be spending more on public transportation? 2. What is the standard error of the proportion? 3. What is the margin...
A researcher is interested in the breakfast and exercise habits of college students. For some randomly...
A researcher is interested in the breakfast and exercise habits of college students. For some randomly selected students, he recorded the number of times they had breakfast in one month and the number of times they went to gym. The correlation for these two variables ended up being 0.74. If a college student who had never previously gone to the gym began going to the gym regularly, what does this imply about the future habits of that student? Select one:...
A study was conducted on a sample randomly selected from city A. The results are presented...
A study was conducted on a sample randomly selected from city A. The results are presented in the table. Based on the information in the table answer the below questions: Age groups Number of participants Proportion of female Relative frequency of participants 15 years or younger 10 0.4   16-25 years 25 0.6   26-30 years 10 1.0   31 years or older 2 1.0   Are the age groups mutually exclusive? Based on the number of participants, can you argue for or against...
A researcher is interested in studying the effects of sleep deprivation on testing performance. He randomly...
A researcher is interested in studying the effects of sleep deprivation on testing performance. He randomly assigns 6 students to either sleep for a normal amount of hours or not sleep at all on the night before a statistics testing Does sleep deprivation affect statistics testing performance? Please use a t-test to demonstrate the result Sleep:94 98 96 No Sleep:87 84 81
A researcher interested in the working habits of students at RCC randomly selects 300 students and...
A researcher interested in the working habits of students at RCC randomly selects 300 students and finds that 23% have a full time job. (a) Did the study use population or sample data? Explain. (b) If sample data was used, what is the population it was drawn from? (c) Is the figure 23% a parameter or a statistic? Explain. (d) Is the variable qualitative or quantitative? Explain.
We randomly chose 20 words from a randomly selected page in the text of interest and...
We randomly chose 20 words from a randomly selected page in the text of interest and counted the number of letters in each word: 5, 5, 2, 11, 1, 5, 3, 8, 5, 4, 7, 2, 9, 4, 8, 10, 4, 5, 6, 6. Suppose the editor was hoping that the book would have a mean length of 6.5 letters. Does this sample indicate that the authors failed to meet this goal? Conduct a hypothesis test showing all 4 elements...
To test the effectiveness of a new drug, a researcher gives one group of randomly selected...
To test the effectiveness of a new drug, a researcher gives one group of randomly selected individuals the new drug and another group of randomly selected individuals a placebo. The results are shown in the table below. Drug 32 (effective) 9 (ineffective) Placebo 12 (effective) 18 (ineffective) At 0.05, can the researcher conclude that the drug results differ from those of the placebo? (Show ALL steps including conditions).
A researcher is interested in how personality types are influenced by distractions. Individuals were selected to...
A researcher is interested in how personality types are influenced by distractions. Individuals were selected to represent two different personality types: introverts and extroverts. Half of the participants in each group were tested in a noisy room, filled with distraction, whereas the other half were tested in a quiet, calm room. The researcher was measuring the number of errors committed by each individual. He found that introverted personalities in a quiet room scored an average of 7, introverted personalities in...
ADVERTISEMENT
ADVERTISEMENT
ADVERTISEMENT