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QNT 275 Week 5 Final Exam Link
https://hwsell.com/category/qnt-275-exam/
A quantitative variable is the only type of variable that can
have no intermediate values
assume numeric values for which arithmetic operations make sense
be graphed
be used to prepare tables
A qualitative variable is the only type of variable that
The following table gives the cumulative frequency distribution of the commuting time (in minutes) from home to work for a sample of 400 persons selected from a city.
The sample size is: The percentage of persons who commute for less than 30 minutes, rounded to two decimal places, is: % The cumulative relative frequency of the fourth class, rounded to four decimal places, is: The percentage of persons who commute for 40 or more minutes, rounded to two decimal places, is: % The percentage of persons who commute for less than 50 minutes, rounded to two decimal places, is: % The number of persons who commute for 20 or more minutes is:
The temperatures (in degrees Fahrenheit) observed during seven days of summer in Los Angeles are 78,99,68,91,97,75,85
The range of these temperatures is:
The variance of these temperatures, rounded to three decimals, is:
The standard deviation, rounded to three decimals, of these temperatures is:
The following table gives the two-way classification of 500 students based on sex and whether or not they suffer from math anxiety
If you randomly select one student from these 500 students, the probability that this selected student is a female is: (round your answer to three decimal places, so 0.0857 would be 0.086)
If you randomly select one student from these 500 students, the probability that this selected student suffers from math anxiety is: (round your answer to three decimal places, so 0.0857 would be 0.086)
If you randomly select one student from these 500 students, the probability that this selected student suffers from math anxiety, given that he is a male is: (round your answer to three decimal places, so 0.0857 would be 0.086)
If you randomly select one student from these 500 students, the probability that this selected student is a female, given that she does not suffer from math anxiety is: (round your answer to three decimal places, so 0.0857 would be 0.086)
Which of the following pairs of events are mutually exclusive?
Are the events “Has math anxiety” and “Person is female” independent or dependent? Detail the calculations you performed to determine this. dependent
For the probability distribution of a discrete random variable x, the sum of the probabilities of all values of x must be
The following table lists the probability distribution of a discrete random variable x
The mean of the random variable x is:
The standard deviation of the random variable x, rounded to three decimal places, is:
The daily sales at a convenience store produce a distribution that is approximately normal with a mean of 1270 and a standard deviation of 136
The probability that the sales on a given day at this store are more than 1,405, rounded to four decimal places, is:
The probability that the sales on a given day at this store are less than 1,305, rounded to four decimal places, is:
The probability that the sales on a given day at this store are between 1,200 and 1,300, rounded to four decimal places, is:
The width of a confidence interval depends on the size of the
population mean
margin of error
sample mean
none of these
A sample of size 67 from a population having standard deviation= 41 produced a mean of 248.00. The 95% confidence interval for the population mean (rounded to two decimal places) is
The lower limit is The upper limit is
The null hypothesis is a claim about a
The alternative hypothesis is a claim about a
In a one-tailed hypothesis test, a critical point is a point that divides the area under the sampling distribution of a
In a two-tailed hypothesis test, the two critical points are the points that divide the area under the sampling distribution of a
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In a hypothesis test, a Type I error occurs when
a true null hypothesis is rejected |
a false null hypothesis is rejected |
a false null hypothesis is not rejected |
a true null hypothesis is not rejected |
In a hypothesis test, a Type II error occurs when
Entry field with correct answer
a false null hypothesis is not rejected
a true null hypothesis is rejected
a true null hypothesis is not rejected
a false null hypothesis is rejected
In a hypothesis test, the probability of committing a Type I error is called the
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confidence interval
significance level
beta error
confidence level