stats

AVX Stereo Equipment, Inc., recently began a "no-hassles" return policy. A sample of 535 customers who recently returned items showed 360 thought the policy was fair, 160 thought it took too long to complete the transaction, and the rest had no opinion. On the basis of this information, make an inference about customer reaction to the new policy. (Round your answers to 1 decimal place.) Customer reaction Percent Fair Too long No opinion The above data suggests that majority of the customers believe the policy is fair correct.

Customer reaction Percent Fair 67.3 correct% Too long 29.9 correct% No opinion 2.8 correct%

Explain the difference between a sample and a population. A __________ is a subset taken from a ____________.

sample, population

The mean number of travel days per year for salespeople employed by three hardware distributors needs to be estimated with a 0.90 degree of confidence. For a small pilot study, the mean was 150 days and the standard deviation was 14 days. If the population mean is estimated within two days, how many salespeople should be sampled? a. 133 b. 452 c. 511 d. 2,100

133

Describe the differences between a histogram and a dot plot. When might a dot plot be better than a histogram? (A) Histogram is better for large data sets and dot plot is better for small data sets. (B) Histogram is better for small data sets and dot plot is better for large data sets.

Histogram is better for large data sets and dot plot is better for small data sets.

To conduct a test of hypothesis with a small sample, we make an assumption that __________. a. A larger computed value of t will be needed to reject the null hypothesis b. The region of acceptance will be wider than for large samples c. The confidence interval will be wider than for large samples d. The population is normally distributed

The population is normally distributed

Exits along interstate highways were formerly numbered successively from the western or southern border of a state. However, the Department of Transportation has recently changed most of them to agree with the numbers on the mile markers along the highway. a. What level of measurement were data on the consecutive exit numbers? b. What level of measurement are data on the milepost numbers? c. The newer system provided information on the distance between exits.

(a) ordinal (b) ratio (c) true

Classify the following as population or sample: (a) 2000 car owners randomly chosen to identify preference for models. (b) All the members of United Nations Organization.

(a) sample (b) population

For the following situations, would you collect information using a sample or a population? a. Statistics 201 is a course taught at a university. Professor Rauch has taught nearly 1,500 students in the course over the past 5 years. You would like to know the average grade for the course. b. As part of a research project, you need to report the average profit as a percentage of revenue for the #1-ranked corporation in the Fortune 500 for each of the last 10 years. c. You are looking forward to graduation and your first job as a salesperson for one of five large pharmaceutical corporations. Planning for your interviews, you will need to know about each company's mission, profitability, products, and markets. d. You are shopping for a new MP3 music player such as the Apple iPod. The manufacturers advertise the number of music tracks that can be stored in the memory. Usually, the advertisers assume relatively short, popular songs to estimate the number of tracks that can be stored. You, however, like Broadway musical tunes and they are much longer. You would like to estimate how many Broadway tunes will fit on your MP3 player.

(a) population (b) population (c) population (d) sample

For the following questions, would you collect information using a sample or a population? (a) To compare the salary of the software and hardware technicians in Washington. (b) To find the number of countries in the world with the nuclear weapons. (c) To find the percentage of users of a soap that a company manufactures. (d) To find how many students in a particular class of a college in New York own PCs.

(a) sample (b) population (c) sample (d) population

What is the level of measurement for each of the following variables? a. Student IQ ratings. b. Distance students travel to class. c. The jersey numbers of a sorority soccer team. d. A student's state of birth. e. A student's academic class—that is, freshman, sophomore, junior, or senior. f. Number of hours students study per week.

a. Interval b. Ratio c. Nominal d. Nominal e. Ordinal f. Ratio

The San Francisco Chronicle is a large newspaper published daily. What is the level of measurement for each of the following variables? a. The number of papers sold each Sunday during 2014. b. The departments, such as editorial, advertising, sports, etc. c. The number of papers sold by county. d. The number of years with the paper for each employee.

a. Ratio b. Nominal c. Ratio d. Ratio

For the following data taken from the USA Today newspaper, choose the correct level of measurement. a. $28.37, $21.40 are the stock prices of a particular month of Microsoft and Intel Corporations. Level of measurement: b. Grey's Anatomy and CSI: Crime Scene Investigation, two television shows are ranked 1 and 2 in Nielsen ratings, Oct. 2 - Oct. 8, 2006. Level of measurement: c. In 1987, 100th Congress of the United States had 412 male and 23 female representatives. Level of measurement: d. 134 and 100 Fahrenheit, the highest temperatures recorded in California and Alaska, respectively. Level of measurement

a. Ratio b. Ordinal c. Nominal d. Interval

For each of the following, determine whether the group is a sample or a population. a. The participants in a study of a new cholesterol drug. b. The drivers who received a speeding ticket in Kansas City last month. c. Those on welfare in Cook County (Chicago), Illinois.

a. Sample b. Population c.Population correct

A poll solicits a large number of college undergraduates for information on the following variables: the name of their cell phone provider (AT&T, Verizon, and so on), the numbers of minutes used last month (200, 400, for example), and their satisfaction with the service (Terrible, Adequate, Excellent, and so forth). What is the level of measurement for each of these three variables? Level of measurement a. The cell phone provider b. The number of minutes used c. Satisfaction with the service

a. nominal b. ratio c. ordinal

From the publication of Statistical Abstract of the United States, data are taken and represented below with details. What kind of scale can be used to measure them? 82 Fahrenheit is the highest temperature recorded in Alabama for the month of February. a. Ordinal b. Ratio c. Interval d. Nominal

interval

Explain the difference between qualitative and quantitative variables. Qualitative data is _____________________, whereas quantitative data is _______________________________

not numerical, numerical

Explain the difference between a discrete and a continuous variable. Discrete variables can assume _____________, but continuous variables can assume _____________________ within some range.

only certain values, any values