QNT 275 FINAL EXAM 2017

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QNT 275 FINAL EXAM 2017

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QNT 275 FINAL EXAM 2017

QNT 275 FINAL EXAM 2017

We can use the analysis of variance procedure to test hypotheses about:

  • the proportion of one population
  • two or more population proportions
  • two or more population means
  • the mean of one population

For a one-tailed test the p-value is:

  • twice the area under the curve to the same side of the value of the sample statistic as is specified in the alternative hypothesis
  • the area under the curve to the same side of the value of the sample statistic as is specified in the alternative hypothesis
  • twice the area under the curve between the mean and the observed value of the sample statistic
  • the area under the curve between the mean and the observed value of the sample statistic

 

In a hypothesis test a Type I error occurs when:

  • 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

You toss a coin nine times and observe 3 heads and 6 tails. This event is a:

  • multiple outcome
  • simple event
  • multinomial sample point
  • compound event

The graph of a cumulative frequency distribution is a(n):

  • stem-and-leaf display
  • frequency histogram
  • ogive
  • line graph

What is the critical value of t for the hypothesis test?

  • 2.441
  • 2.449
  • 2.733
  • 2.738

An error that occurs because of chance is called:

  • mean error
  • probability error
  • sampling error
  • nonsampling error

A researcher wants to test if elementary school children spend less than 30 minutes per day on homework. The alternative hypothesis for this example will be that the population mean is:

  • equal to 30 minutes
  • not equal to 30 minutes
  • less than or equal to 30 minutes
  • less than 30 minutes

A quantitative variable is the only type of variable that can:

  • have no intermediate values
  • be used to prepare tables
  • assume numeric values for which arithmetic operations make sense
  • be graphed

Which of the following pairs of events are mutually exclusive?

  • Female and no
  • Female and yes
  • Female and male
  • No and yes

In a hypothesis test a Type II error occurs when:

  • a false null hypothesis is rejected
  • a true null hypothesis is rejected
  • a true null hypothesis is not rejected
  • a false null hypothesis is not rejected

Two paired or matched samples would imply that:

  • data are collected on two variables from the elements of two independent samples
  • two data values are collected from the same source (elements) for two dependent samples
  • two data values are collected from the same source (elements) for two independent samples
  • data are collected on one variable from the elements of two independent samples

The p-value is the:

  • largest significance level at which the alternative hypothesis can be rejected
  • smallest significance level at which the null hypothesis can be rejected
  • largest significance level at which the null hypothesis can be rejected
  • smallest significance level at which the null hypothesis can be rejected

If you divide the number of elements in a sample with a specific characteristic by the total number of elements in the sample, the dividend is the:

  • sampling distribution
  • sample distribution
  • sample mean
  • sample proportion

A linear regression:

  • gives a relationship between two variables that can be described by a line
  • gives a relationship between two variables that cannot be described by a line
  • gives a relationship between three variables that can be described by a line
  • contains only two variables

A continuous random variable x has a right-skewed distribution with a mean of 80 and a standard deviation of 12. The sampling distribution of the sample mean for a sample of 50 elements taken from this population is:

  • skewed to the left
  • not normal
  • approximately normal
  • skewed to the right

Which of the following assumptions is not required to use ANOVA?

  • All samples are of the same size.
  • The samples drawn from different populations are random and independent.
  • The populations from which the samples are drawn are (approximately) normally distributed.
  • The populations from which the samples are drawn have the same variance.

The model y = A + Bx is a:

  • nonlinear model
  • stochastic model
  • probabilistic model
  • deterministic model

The mean of a discrete random variable is its:

  • second quartile
  • box-and-whisker measure
  • upper hinge
  • expected value

In a one-way ANOVA, we analyze only one:

  • population
  • mean
  • variable
  • sample

The regression model y = A + Bx + e is:

  • an exact relationship
  • a probabilistic model
  • a nonlinear model
  • a deterministic model

For a goodness-of-fit test, the frequencies obtained from the performance of an experiment are the:

  • objective frequencies
  • observed frequencies
  • subjective frequencies
  • expected frequencies

The mean of a discrete random variable is the mean of its:

  • frequency distribution
  • second and third quartiles
  • percentage distribution
  • probability distribution

A researcher wants to test if the mean annual salary of all lawyers in a city is different than $110000. The null hypothesis for this example will be that the population mean is:

  • greater than to $110,000
  • not equal to $110,000
  • equal to $110,000
  • less than to $110,000

To make tests of hypotheses about more than two population means we use the:

  • t distribution
  • normal distribution
  • chi-square distribution
  • analysis of variance distribution

You randomly select two households and observe whether or not they own a telephone answering machine. Which of the following is a simple event?

  • At most one of them owns a telephone answering machine.
  • At least one of them owns a telephone answering machine.
  • Neither of the two owns a telephone answering machine.
  • Exactly one of them owns a telephone answering machine.

 

What is the critical value of z for the hypothesis test?

  • -2.05
  • -2.33
  • -2.17
  • -1.96

A qualitative variable is the only type of variable that:

  • can assume an uncountable set of values
  • cannot be measured numerically
  • cannot be graphed
  • can assume numerical values

The alternative hypothesis is a claim about a:

  • statistic, where the claim is assumed to be false until it is declared true
  • parameter, where the claim is assumed to be true until it is declared false
  • statistic, where the claim is assumed to be true if the null hypothesis is declared false
  • parameter, where the claim is assumed to be true if the null hypothesis is declared false

For small degrees of freedom, the chi-square distribution is:

  • rectangular
  • skewed to the left
  • symmetric
  • skewed to the right

QNT 275 FINAL EXAM 2017

QNT 275 FINAL EXAM 2017