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WorksheetsIdentify the form of Inference
Total questions: 15
Worksheet time: 10mins
Name
Class
Date
1.
A random sample of students at a college shows that 54 of 200 students had part-time jobs. We want to estimate the proportion of all college students with part time jobs
a)
1 prop z-interval
b)
1 sample t-interval
c)
1 prop z-test
d)
1 sample t-test
2.
A researcher wanted to see whether there is a significant difference in resting pulse rates for men and women. He collected the resting pulse rates for 28 men and 24 women.
a)
1 sample t test
b)
2 sample t test
c)
1 sample t interval
d)
2 sample t interval
e)
Matched pair t test
3.
Fred wants to estimate the average length (in minutes) of the movies he watches, so he selects a random sample of 15 movies and watches them.
a)
1 prop z interval
b)
1 sample t interval
c)
1 prop z test
d)
1 sample t test
4.
A group of musicians count how many times they can snap their fingers in 10 seconds with their dominant hands and with their nondominant hands. They will test to see if musicians can snap faster with dominant hands than nondominant hands
a)
1 sample t test
b)
2 sample t test
c)
1 sample z test
d)
2 sample z test
5.
A group of musicians is trying to measure the effectiveness of practice time. Half of them practice a difficult piece of music for one hour each day while the other half practice two hours each day. After a week, each musician plays the piece as a judge counts the number of errors. They will test o see if more practice results in fewer errors.
a)
1 sample t test
b)
2 sample t test
c)
1 prop z test
d)
2 prop z test
6.
The 2017 senior class at Rancho High believes that they have better grades than their predecessors. The class president, a Statistics student, calculates the the mean GPA for the 725 seniors to be 2.97 with a standard deviation of 0.67. The Class of 2016 had a mean of 2.83 and std dev of 0.81.
a)
1 sample t test
b)
2 sample t test
c)
1 prop z test
d)
2 sample z test
7.
Students investigating the packaging of potato chips purchased 6 bags of Lay's Ruffles marked with a net weight of 28.3 grams. They carefully weighed the contents of each bag in order to determine if the bags were underweight.
a)
1 sample t test
b)
2 sample t test
c)
1 sample t interval
d)
2 sample t interval
8.
A tire manufacturer tests the braking performance of one of its tire models on a test track. the company tried the tires on 10 different cars, recording the stopping distance for each car on both wet and dry pavement. Is there evidence to suggest the brakes work better on dry pavement?
a)
1 sample t test
b)
2 sample t test
c)
1 prop z test
d)
2 sample z test
9.
A company know that last year 40% of its reports in accounting were on time. Using a random sample this year, it wants to see if that proportion has changed.
a)
1 prop z interval
b)
2 prop z interval
c)
1 prop z test
d)
2 prop z test
10.
Does a new vaccine work to treat ear infections in youngsters like Maxwell? A study divided toddlers into 2 groups. One group received vaccinations, the other did not. 333 of 2455 vaccinated children had ear infections compared to 499 of 2452 unvaccinated children.
a)
2 sample t test
b)
2 prop z test
c)
2 sample t interval
d)
1 prop z test
11.
Researchers are interested in estimating the average difference in sugar content in adults' cereal vs. children's cereal.
a)
1 sample t test
b)
2 sample t test
c)
1 sample t interval
d)
2 sample t interval
12.
Many people think premium gas is better than regular. To test that belief, we use 10 cars from a company fleet in which all the cars run on regular gas. Each car is filled first with either regular or premium gas, decided by a coin toss, and the mileage is recorded for that tankful. Then the mileage is recorded again for the same cars for a tankful of the other kinds of gasoline.
a)
1 sample t test
b)
2 sample t test
c)
1 prop z test
d)
2 prop z test
13.
Do consumers spend more on a trip to Walmart or Target? Suppose researchers interested in this question collected a systematic sample from 85 Walmart customers and 80 Target customers by asking customers for the purchase amount as they left the stores.
a)
1 sample t test
b)
2 sample t test
c)
1 sample t interval
d)
2 sample t interval
14.
An English professor is attempting to estimate the mean number of novels that the student body reads during their time in college. He conducts an exit survey with 120 seniors and records the number of books each read.
a)
1 sample t test
b)
2 sample t test
c)
1 sample t interval
d)
2 sample t interval
15.
A nutrition lab tests 40 hot dogs to see if their mean sodium content was less than the 325 mg upper limit set by regulations for "reduced sodium" franks.
a)
1 sample t test
b)
2 sample t test
c)
1 prop z test
d)
1 sample t interval
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