A recent study suggested that 70% of all eligible voters will vote in the next presidential election. Suppose 20 eligible voters were randomly selected from the population of all eligible voters. Use a binomial probability table to find the probability that more than 10 but fewer than 16 of the 20 eligible voters sampled will vote in the next presidential election. A) 845 B) 714 C) 649 D) 780
Contingency Table
A contingency table can be defined as the visual representation of the relationship between two or more categorical variables that can be evaluated and registered. It is a categorical version of the scatterplot, which is used to investigate the linear relationship between two variables. A contingency table is indeed a type of frequency distribution table that displays two variables at the same time.
Binomial Distribution
Binomial is an algebraic expression of the sum or the difference of two terms. Before knowing about binomial distribution, we must know about the binomial theorem.
A recent study suggested that 70% of all eligible voters will vote in the next presidential election. Suppose 20 eligible voters were randomly selected from the population of all eligible voters. Use a binomial
- A) 845
- B) 714
- C) 649
- D) 780
13) Management at a home improvement store randomly selected 120 customers and observed their shopping habits. They recorded the number of items each of the customers purchased as well as the total time the customers spent in the store. Identify the types of variables recorded by the managers of the home improvement store.
- A) number of items – continuous; total time – discrete
- B) number of items – discrete; total time – discrete
- C) number of items – continuous; total time – continuous
- D) number of items – discrete; total time – continuous
An alarm company reports that the number of alarms sent to their monitoring center from customers owning their system follow a Poisson distribution with λ = 4.7 alarms per year. Identify the mean and standard deviation for this distribution.
- A) mean = 4.7, standard Deviation = 4.7
- B) mean = 2.17, standard Deviation = 2.17
- C) mean = 2.17, standard Deviation = 4.7
- D) mean = 4.7, standard Deviation = 2.17
15) The school newspaper surveyed 100 commuter students and asked two questions. First, students were asked how many courses they were currently enrolled in. Second, the commuter students were asked to estimate how long it took them to drive to campus. Considering these two variables, number of courses would best be considered a ___________ variable and drive time would be considered a _____________ variable.
- A) discrete; discrete
- B) continuous; continuous
- C) continuous; discrete
- D) discrete; continuous
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