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A telephone survey to determine viewer response to a new television show obtained the following data. $$\begin{array}{lc} \text { Rating } & \text { Frequency } \\ \text { Poor } & 4 \\ \text { Below average } & 8 \\ \text { Average } & 11 \\ \text { Above average } & 14 \\ \text { Excellent } & 13 \end{array}$$ a. What is the probability that a randomly selected viewer will rate the new show as average or better? b. What is the probability that a randomly selected viewer will rate the new show below average or worse?

Short Answer

Expert verified
a. 0.76; b. 0.24.

Step by step solution

01

Calculate Total Frequency

First, we need to determine the total number of responses by adding all the frequencies together. This gives us the total number of ratings collected in the survey. \[ \text{Total Frequency} = 4 + 8 + 11 + 14 + 13 \] Calculating this gives us \[ \text{Total Frequency} = 50 \]
02

Identify Ratings 'Average or Better'

Next, identify the ratings that are considered 'Average or better'. These ratings include 'Average', 'Above average', and 'Excellent'. We sum their frequencies:\[ 11 + 14 + 13 = 38 \]
03

Calculate Probability for 'Average or Better'

We calculate the probability that a randomly selected viewer rated the show as 'Average or better'. This is the ratio of the number of 'Average or better' ratings to the total number of responses.\[ P(\text{Average or better}) = \frac{38}{50} \] Simplifying this gives us: \[ P(\text{Average or better}) = 0.76 \]
04

Identify Ratings 'Below Average or Worse'

Next, identify the ratings that are regarded as 'Below average or worse'. These ratings include 'Poor' and 'Below average'. We add their frequencies:\[ 4 + 8 = 12 \]
05

Calculate Probability for 'Below Average or Worse'

We calculate the probability that a randomly selected viewer rated the show as 'Below average or worse'. This is the ratio of the number of 'Below average or worse' ratings to the total number of responses.\[ P(\text{Below average or worse}) = \frac{12}{50} \] Simplifying this gives us: \[ P(\text{Below average or worse}) = 0.24 \]

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Survey Analysis
Survey analysis is a crucial process that involves collecting and examining data to draw conclusions. In this case, a telephone survey was conducted to understand viewer responses to a new television show. By gathering data on how viewers rated the show, we can gain insights into their opinions.
The survey used a set rating scale that included categories like 'Poor', 'Below Average', 'Average', 'Above Average', and 'Excellent'. Each respondent's choice was recorded, resulting in specific frequency counts for each category.

Survey analysis helps answer questions such as:
  • How many people found the show above average?
  • What proportion rated it poorly?
By systematically analyzing this data, survey analysts can help decision-makers improve content or targeting strategies based on viewer feedback.
Frequency Distribution
Frequency distribution is a simple yet powerful way to represent survey data. It shows how often each response occurs. In our exercise, the data is displayed using a frequency distribution table.
Frequency distribution provides a clear snapshot of your data:
  • 'Poor': 4 responses
  • 'Below Average': 8 responses
  • 'Average': 11 responses
  • 'Above Average': 14 responses
  • 'Excellent': 13 responses
Each number signifies the number of viewers who rated the show at that level. This organization helps in quickly understanding patterns, such as which rating is most common. It also lays the groundwork for further statistical analysis.
Statistical Probability
Statistical probability allows us to predict outcomes based on data. In our scenario, it helps determine the likelihood of different ratings from viewers. To find the probability of specific ratings, we compare the frequency of those ratings to the total number of responses.
For instance:- The probability that a randomly selected viewer rated the show 'Average or better' is calculated as follows: \[ P(\text{Average or better}) = \frac{38}{50} = 0.76 \] - Similarly, the probability of a 'Below average or worse' rating is found by: \[ P(\text{Below average or worse}) = \frac{12}{50} = 0.24 \] These probabilities provide clear, quantifiable outcomes, making it easier to interpret survey results and forecast future responses.
Rating Scale Analysis
Rating scale analysis involves breaking down categories within survey responses to better understand preferences or opinions. In the exercise, we used a rating scale from 'Poor' to 'Excellent'. This structure enables respondents to express nuances in their reactions beyond a simple yes or no.
Through rating scale analysis, you can:
  • Identify which categories receive the most attention.
  • Understand the range of opinions, from dislike to high approval.
The analysis of ratings 'Average or better' vs. 'Below average or worse' shows how dividing responses into categories helps in comprehending overall satisfaction or dissatisfaction. Such scales enrich both qualitative and quantitative analysis by capturing detailed sentiments about the show.

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Most popular questions from this chapter

A Morgan Stanley Consumer Research Survey sampled men and women and asked each whether they preferred to drink plain bottled water or a sports drink such as Gatorade or Propel Fitness water (The Atlanta Journal-Constitution, December 28,2005 ). Suppose 200 men and 200 women participated in the study, and 280 reported they preferred plain bottled water. Of the group preferring a sports drink, 80 were men and 40 were women. Let \(M=\) the event the consumer is a man \(W=\) the event the consumer is a woman \(B=\) the event the consumer preferred plain bottled water \(S=\) the event the consumer preferred sports drink a. What is the probability a person in the study preferred plain bottled water? b. What is the probability a person in the study preferred a sports drink? c. What are the conditional probabilities \(P(M | S)\) and \(P(W | S) ?\) d. What are the joint probabilities \(P(M \cap S)\) and \(P(W \cap S) ?\) e. Given a consumer is a man, what is the probability he will prefer a sports drink? f. Given a consumer is a woman, what is the probability she will prefer a sports drink? g. Is preference for a sports drink independent of whether the consumer is a man or a woman? Explain using probability information.

Reggie Miller of the Indiana Pacers is the National Basketball Association's best career free throw shooter, making \(89 \%\) of his shots \((U S A \text { Today, January } 22,2004\) ). Assume that late in a basketball game, Reggie Miller is fouled and is awarded two shots. a. What is the probability that he will make both shots? b. What is the probability that he will make at least one shot? c. What is the probability that he will miss both shots? d. Late in a basketball game, a team often intentionally fouls an opposing player in order to stop the game clock. The usual strategy is to intentionally foul the other team's worst free throw shooter. Assume that the Indiana Pacers' center makes \(58 \%\) of his free throw shots. Calculate the probabilities for the center as shown in parts (a), (b), and (c), and show that intentionally fouling the Indiana Pacers' center is a better strategy than intentionally fouling Reggie Miller.

How many permutations of three items can be selected from a group of six? Use the letters \(A\), B, \(C, D, E,\) and \(F\) to identify the items, and list each of the permutations of items \(B, D,\) and \(F\)

Data on the 30 largest stock and balanced funds provided one-year and five- year percentage returns for the period ending March 31,2000 (The Wall Street Journal, April 10,2000 ). Suppose we consider a one-year return in excess of \(50 \%\) to be high and a five-year return in excess of \(300 \%\) to be high. Nine of the funds had one-year returns in excess of \(50 \%\) seven of the funds had five-year returns in excess of \(300 \%\), and five of the funds had both one-year returns in excess of \(50 \%\) and five-year returns in excess of \(300 \%\) a. What is the probability of a high one-year return, and what is the probability of a high five-year return? b. What is the probability of both a high one-year return and a high five-year return? c. What is the probability of neither a high one-year return nor a high five- year return?

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