Question

Need help with question 65!

information to answer the next two exercis0s e duration (amount of time) of resident A study was done to determine the age, number of times pe use of a local park in San Jose. The first house in the neighborhood around the park then every 8th house in the neighborhood around the park was interviewed 63. "Number of times per weok" is what type of data? a qualitative Quantitative discrote c. quantitative continuous 64. "Duration (amount of time)" is what type of data? a qualitative b quantitative discrete quantitative continuous 65. Airline companies are interested in the consistency of the number of babies on each fight, so that they have adequate safety equipment. Suppose an airline conducts a survey. Over Thanksgiving weekend, it surveys six flights from Boston to Salt Lake City to determine the number of babies on the flights. It determines the amount of safety equipment needed by the result of that study a Using complete sentences, list three things wrong with the way the survey was conducted b Using complete sentences, list three ways that you would improve the survey if it were to be repeated. 71. The instructor takes her sample by gathering data on five randomly selected students from each Lake Tahoe Community College math class. The type of sampling she used is a cluster sampling b. stratified sampling c. simple random sampling d convenience sampling tuthcs done to determine the age, number of times per week, and the duration (amount of time) of residents using a

Answer 1

Answers to question 63 and 64 are correct.

65. a. Three things that were wrong in the survey are :-

-> The survey is conducted at Thanksgiving weekend, which is not a normal time and tourist surge is expected at that time. Hence number of babies on flights is supposed to be more around that time than at most other times around the calendar.

->The survey only is performed on 6 flights between one route. However to get a better estimate one should conduct surveys from a lot of routes to get a better estimate. Surveying from one single route one might come to false conclusions.

-> The survey takes into account only 6 flights, however we do not know if that is enough to get a good enough estimate of the number of babies in a flight.

Three ways the survey could be improved upon are as follows:-

-> The survey must be conducted at a regular week and not some holiday period when people tend to travel more often.

-> The survey must be conducted using flights from not just one route but along many other routes. This would give us a better estimate of the quantity we are interested in.

-> It is absurd to randomly survey just 6 flights. Now that we have the standard error of the sample from the previous survey. We can use it to determine required sample size to get a good enough estimate.

71. This is an example of stratified sampling. Here the entire population is divided into stratas such that each and every population unit falls under one and only one strata. Now from each strata we randomly sample a particular number of units.