Quiz 15
The prices (in dollars) of 12 outpatient services are listed below. Find the range for the given sample data. 865 1010 655 565 1465 1110 710 765 820 1310 555 1065
$910
Determine the type of sampling used: systematic, convenience, stratified, or cluster.To obtain a sample of pregnant women, a researcher contacts her son's preschool teacher for a list of names.
. Convenience
Determine whether the given value is a statistic or a parameter.In studying the loggerhead turtle on Anna Maria Island, FL, scientists observe the average (mean) number of hatchlings in all 253 nests.
Parameter
Identify the type of observational study: cross-sectional, retrospective, or prospective.A researcher from the department of defense is studying the psychology of trauma.He plans to follow the children of service members who died in Afghanistan for the next 20 years.
Prospective
Determine which of the four levels of measurement is most appropriate. Doctors measure the weights (in pounds) of pregnant women.
Ratio
Determine which of the four levels of measurement is most appropriate.Doctors measure the weights (in pounds) of preterm babies.
Ratio
A Type I error is the mistake of ________ when it is actually true.
rejecting the null hypothesis
The P-value is the probability of getting a test statistic at least as extreme as the one representing the sample data, assuming that ________.
the null hypothesis is true
Determine which of the four levels of measurement is most appropriate.Ornithologists classify hummingbirds in the United States using 17 different species: Allen, Anna, Berylline, Black-chinned, Blue-throated, Broad-billed, Broad- tailed, Buff-bellied, Calliope, Costa, Lucifer, Magnificent, Ruby-throated, Rufous, Violet-crowned, White-eared, and Xantus.
Nominal
Determine whether the given description corresponds to an observational study or an experiment.In a study of cold symptoms, the body temperatures of study participants were taken.
Observational study
Determine whether the given description corresponds to an observational study or an experiment.In a study of the Bald Eagle population, the number of breeding pairs is counted.
Observational study
Determine whether the given description corresponds to an observational study or an experiment.Patients with severe heart failure were randomly assigned to two treatment groups to compare death and hospitalization rates. One group was treated with drug therapy while the other group was treated with a combination of drugs and an electrical device.
Experiment
Determine which of the four levels of measurement is most appropriate. Biologists measure the water temperature of the Merrimack River in New Hampshire.
Interval
Determine which of the four levels of measurement is most appropriate.Biologists monitor the air temperature of the Biosphere 2 in Oracle, Arizona.
Interval
Determine whether the given values are from a discrete or a continuous data set.The Produce for Better Health Foundation manages the campaign advocating consumers to eat "5 Fruits and Vegetables A Day for Better Health" and gathers data on the number of servings of fruit and vegetables that a sample of Americans ate yesterday
. Discrete
Express the indicated degree of likelihood as a probability value."Your mother could not have died two years before you were born."
0
The frequency distribution below summarizes employee years of service for a regional hospital. Determine the class boundary(ies) for the class 11-15. Years ofService. Frequency 1-5. 5 6-10 20 11-15 25 16-20. 10 21-25. 5 26-30. 3
10.5 and 15.5 years
The histogram below represents the number of digital thermometers per household for a sample of U.S. households. What is the sample size?
100 households
Use the frequency distribution below to answer the following question(s). A sample of 80 juvenile salmon is grouped into the resulting frequency distribution based on their weights Weight (in grams). Frequency 100-149 15 150-199. 10 200-249. 30 250-299. 25 If a relative frequency distribution were constructed for the weights of the salmon, what would be the relative frequency for the class weighing 150-199 grams?
12.5%
The weights (in pounds) of 22 members of the junior varsity football team are listed below. 144 152 142 151 160 152 131 164 141 153 140 144 175 156 147 133 172 159 135 159 148 171 Which of these choices displays the correct stemplot?
13 1 3 5 14 0 1 2 4 4 7 8 15. 1 2 2 3 6 9 9 16. 0 4 17 1 2 5
Use the frequency distribution below to answer the following question(s). A sample of 80 juvenile salmon is grouped into the resulting frequency distribution based on their weights. Weight (in grams). Frequency 100-149 15 150-199. 10 200-249. 30 250-299. 25 If a pie chart were constructed for the weights of the salmon, what would be the measure of the central angle for the class weighing 200-249 grams? Select one:
135°
A marine biologist kept track of the number of shark sightings each week over a seven-week period. The results are shown below. 81 71 202 113 269 248 242Find the median number of shark sightings.
202 sharks
The number of moles on patients' bodies was recorded. The results are shown below. Find the median number of moles on patients' bodies. 25 27 25 28 28 25 30 27 35 31 31 29 24 31 25 20 15 27 27 27
27 moles
The following data show the number of patients seen by a doctor in a day for twelve days. 46 65 55 43 51 48 57 30 43 49 32 56 Which of these choices displays the correct stemplot?
3 | 0 2 4 | 3 3 6 8 9 5 | 1 5 6 7 6 | 5
In a poll of randomly selected adults, 66% said that they worry about getting cancer. For a group of 1013 adults, the mean of those who do not worry about getting cancer is closest to:
344 adults
A nurse measured the blood pressure of each person who visited her clinic. Following is a relative-frequency histogram for the systolic blood pressure readings for those people aged between 25 and 40 years. The blood pressure readings were given to the nearest whole number. Approximately what percentage of the people aged 25-40 had a systolic blood pressure reading between 110 and 119 mm Hg inclusive? Systolic Blood Pressure for People Aged 25-40 Years
35%
The following frequency distribution represents the age at which Alzheimer's was first diagnosed. Find the class midpoint for the interval 70-79. Age. Number of Diagnoses 50-59 2 60-69 4 70-79. 6 80-89. 15 90-99. 5
74.5 years
A nurse measured the blood pressure of each person who visited her clinic. Following is a relative-frequency histogram for the systolic blood pressure readings for those people aged between 25 and 40 years. The blood pressure readings were given to the nearest whole number. Approximately what percentage of the people aged 25-40 had a systolic blood pressure reading between 110 and 139 mm Hg inclusive? Systolic Blood Pressure for People Aged 25-40 Years
75%
Match the following values as a A) discrete random variable, B) continuous random variable, or C) not a random variable: Exact weights of newborn babies ________Shoe sizes of humans ________Gender classification of adults in the United States ________
B, A, C
Determine the type of sampling used: systematic, convenience, stratified, or cluster.To conduct a study of hospital admittance procedures, a list of hospital locations according to county is compiled. All the hospitals from 20 randomly selected counties are selected to be surveyed.
Cluster
Determine the type of sampling used: systematic, convenience, stratified, or cluster.To conduct a survey of the interest of U.S. citizens in Yellowstone National Park, a list of zipcodes is compiled. All citizens in 50 different zipcodes are selected to be mailed a survey.
Cluster
Determine whether the given values are from a discrete or a continuous data set.A sample of male Bighorn sheep has an average (mean) horn base circumference of 43.2 centimeters.
Continuous
Identify the given random variable as being discrete or continuous. The time for a medication to take effect.
Continuous
Determine the type of sampling used: systematic, convenience, stratified, or cluster.To obtain a sample of diabetics, a graduate student contacts nearby hospitals for a list of names.
Convenience
A researcher records the number of new loggerhead turtle nests she locates each day. The data are as follows. 10 11 8 14 7 10 10 11 8 7Which of these choices displays the correct dotplot?
D
Determine whether the given values are from a discrete or a continuous data set. The number of hatchlings from a sample of 45 bluebird nests is 135.
Discrete
Determine whether the given values are from a discrete or a continuous data set.People are asked to state how many times in the last month they visited their family doctor.
Discrete
Suppose we want to test the claim that less than ½ of Americans support a national health insurance system. Is the hypothesis test left-tailed, right-tailed, or two-tailed?
Left-tailed
Determine which of the four levels of measurement is most appropriate. Scientists classify the four major deserts in North America using different regions: the Great Basin, the Mojave, the Sonoran, and the Chihuahuan
Nominal
Determine which of the four levels of measurement is most appropriate.Physicians rank the severity of asthma using mild intermittent asthma, mild persistent asthma, moderate persistent asthma, severe persistent asthma, or brittle asthma.
Ordinal
Determine which of the four levels of measurement is most appropriate.The income range of attendees at a research conference is gathered as upper, middle, and low levels.
Ordinal
The scatterplot below displays the amount of nitrous oxide (NO) explained by the amount of carbon monoxide (CO) emissions in million metric tons over a ten year period in the United States. Select the choice that best describes any relationship between the variables.
Overall, there is no noticeable relationship between NO and CO.
Determine whether the given value is a statistic or a parameter. Nurses measure and calculate the average (mean) body temperature for all 187 patients at a regional hospital.
Parameter
Use the information below to answer the following question(s). In a certain region, a researcher found that among 2000 people who survived to their 66th birthday, there were 40 deaths before they reached age 67. Use Table 14-1 and a significance level of 0.05 to test the claim that this is an unusually high number of deaths. State a conclusion about the null hypothesis.
Reject H0
Identify the type of observational study: cross-sectional, retrospective, or prospective.Scientists studying the migration habits of Aleutian geese collect data from reports measuring the number of geese during "fly-offs" over the past 15 years.
Retrospective
Use the frequency distribution below to answer the following question(s). A sample of 80 juvenile salmon is grouped into the resulting frequency distribution based on their weights. Weight (in grams). Frequency 100-149 15 150-199. 10 200-249. 30 250-299. 25 The distribution of the histogram for the weights of the juvenile salmon appears ________.
Skewed left
Determine whether the given value is a statistic or a parameter.A sample of Medtronic's rechargeable implanted spine stimulator batteries lasted an average (mean) of nine years.
Statistic
Determine the type of sampling used: systematic, convenience, stratified, or cluster.Biologists divide the regions where Red foxes are found into the Nearctic, Palearctic, Oriental, Ethiopian, and the Australian region. They plan to follow 100 female foxes from each region to find the average (mean) number of their offspring.
Stratified
Determine the type of sampling used: systematic, convenience, stratified, or cluster.Medical researchers following living organ donors classify donors according to whether they donated a kidney, a portion of the liver, a portion of the lung, bone marrow, or blood. The general health of 200 donors from each category is monitored for five years.
Stratified
Determine the type of sampling used: systematic, convenience, stratified, or cluster.A county water quality control officer obtains a list of all residential addresses in the county and constructs a sample of homes to monitor by selecting every 200th home on the list.
Systematic
Determine the type of sampling used: systematic, convenience, stratified, or cluster.Biologists studying the pH level of state waterways obtain a sample of streams from a randomly generated list by selecting every 5th stream on the list.
Systematic
Which of the following definitions is the definition of the MODE?
The MODE is the value that has the highest frequency.
Use the information below to answer the following question(s). In a certain region, a researcher found that among 2000 people who survived to their 66th birthday, there were 40 deaths before they reached age 67. Use Table 14-1 and a significance level of 0.05 to test the claim that this is an unusually high number of deaths. State a final conclusion that addresses the original claim.
The sample data support the claim that this is an unusually high number of deaths.
Formulate the indicated conclusion in nontechnical terms. Be sure to address the original claim. Carter Motor Company claims that its new sedan, the Libra, will average better than 32 miles per gallon in the city. Assuming that a hypothesis test of the claim has been conducted and that the conclusion is to reject the null hypothesis, state the conclusion in nontechnical terms.
There is sufficient evidence to support the claim that the mean is greater than 32 miles per gallon.
True or False: A period life table describes mortality and longevity data for a hypothetical cohort, with the data computed with this assumption.
True
A ________ error is the mistake of rejecting the null hypothesis when it is actually true.
Type I
Identify the population.A graduate student conducts a research study on undergraduate student smoking habits. She begins with a survey to 500 randomly selected undergraduate students from 10 randomly selected U.S. universities.
Undergraduate students from U.S. universities
When is logistic regression used for finding a regression equation?
When the response variable is a dummy variable.
To assess the variation in measurement (in cubic centimeters) of pre-filled syringes containing experimental cervical cancer vaccine, manufacturers select every 200th syringe beginning at a random moment. Does this sampling plan result in a random sample? Simple random sample?
Yes; no
To assess the variation in volume (in cubic centimeters) of different manufacturers' pre-filled hormone injections, reproductive biologists select every 50th syringe beginning at a random moment. Does this sampling plan result in a random sample? Simple random sample?
Yes; no
To monitor levels of the giardia parasite in the Rio Grande, aquatic biologists collect test tube samples at various locations determined by a computer randomization program. Does this sampling plan result in a random sample? Simple random sample?
Yes; yes
To monitor the population of Herring in Manchester, New Hampshire, fisheries biologists catch samples of the fish in a river at various locations determined by a computer randomization program. Does this sampling plan result in a random sample? Simple random sample?
Yes; yes
A 0.05 significance level is being used to test a correlation between two variables. If the linear correlation coefficient r is found to be 0.591 and the critical values are r = + 0.878, what can you conclude?
a. There is not sufficient evidence to support the claim of a linear correlation between the two variables. Correc
Which of these is an example of a categorical variable?
flavor of soft drink ordered by each customer at a fast food restaurant
In a cross-sectional study, data are ________.
observed, measured, and collected at one point of time
A ________ is the complete collection of all measurements or data, whereas, a ________ is a subcollection of members selected from the complete collection.
population; sample
