Question

1.   Student's t test for correlated groups really reduces to _________.

a.

the sign test

b.

Student's t test for single samples using difference scores

c.

Students t test for independent groups

d.

none of the above

 

 

2. The z test for independent groups is seldom used because _________.

  1. it lacks sensitivity
  2. it is too complicated
  3. we seldom know the population variances
  4. the sampling distribution of z under H0 is unknown

 

 

 

 

3.           In a t test, when the size of the sample is increased, the confidence interval _________.

  1. increases
  2. decreases
  3. stays the same
  4. changes shape
  5. a and d

 

 

4. As the df increases, the t distribution _________.

  1. gets more symmetrical
  2. approaches the normal distribution
  3. stays the same
  4. becomes more skewed

Expert Answer

Want to see the step-by-step answer?

Check out a sample Q&A here.

Want to see this answer and more?

Experts are waiting 24/7 to provide step-by-step solutions in as fast as 30 minutes!*

*Response times may vary by subject and question complexity. Median response time is 34 minutes for paid subscribers and may be longer for promotional offers.
Tagged in
Math
Statistics

Hypothesis Testing

Related Statistics Q&A

Find answers to questions asked by students like you.

Q: 11.6.37    Question Help     The mathematics department of a college has 13 male​ professors...

A: The mathematics department of a college has 13 male​ professors 12 female​ professors 9 male teach...

Q: Statistics Question

A: Note: Since you have asked multiple questions, we will solve the first question for you. If you want...

Q: A random sample of n = 64 scores is obtained from a normal population with µ = 30 and σ = 10. What i...

A:    

Q: Based on sample data, newborn males have weights with a mean of 3243.2 g and a standard deviation of...

A: Concept: A z-score is known as the standard score that determines how much the data point deviates ...

Q: Statistics Question

A: Given: n = 509 Part 1: Let the proportion of people who purchased eggs based on the good animal welf...

Q: A distribution has a mean of 100 and a median of 90. The shape of this distribution is most likely: ...

A: The right-skewed distribution in which most of the data lie on the left side of the number line that...

Q: A decision maker is interested in estimating the mean of a population based on a random sample. She ...

A: Given: Margin of error = E = ± 0.50 ∝ = 0.05 From the given data we compute the mean and variance as...

Q: Confidence Interval for One Population Proportion In the article "Explaining an Unusual Allergy," ap...

A: Click to see the answer

Q: Some researchers claim that herbal supplements such as ginseng or ginkgo biloba enhance human memory...

A: Given Information: Sample size (n) = 25  µ = 70 and σ = 15. Sample mean (M) = 75 Significance level ...

Q: The most common intelligence quotient (IQ) scale is Normally distributed with a mean of \\( 100 \\) ...

A: From the provided information, Mean (µ) = 100 Standard deviation (σ) = 15 Let X be a random variable...

Q: In the Aloha state, you are very unlikely to be murdered! However, it is considerably more likely th...

A: Given that, The following numbers represent the crime rates per 100,000 population in Hawaii: murder...

Q: An elevator has a placard stating that the maximum capacity is 1896 lb—12 passengers.​ So, 12 adult ...

A: Given Information :  An elevator has a placard stating that the maximum capacity is 1896 lb—12 passe...

Q: The average age for licensed drivers in the county is u of o = 13.2 years. 40.3 years with a standar...

A: (a) The average age for licensed drivers in the country is μ=40.3 and σ=13.2. The sample mean is M= ...

Q: An investigation is carried out to determine whether face to face or virtual learning is more effect...

A: 1. Here, the 12 students took an IT course virtual and 14 took it face to face. That is, the two sam...

Q: Identify the type of sampling technique in the situations described below: The name of each contesta...

A: 1. Simple Random Sampling Technique: This is a simple random sampling technique as each contestant h...

Q: Age at onset of dementia was determined in the general population to be 70 and standard deviation 5....

A: Given Information: Age at onset of dementia was determined in the general population to be mean 70 a...

Q: 11.6.91         It is computed that when a basketball player shoots a free​ throw, the odds ...

A: Given that, When a basketball player shoots a free​ throw, the odds in favor of his making it are 22...

Q: Capacity and price data for a collection of USB flash drives is displayed in the table below. Cap...

A: Click to see the answer

Q: How do you prove that the normally distributed assumption has been met for a Two Proportion z Test? ...

A: Two proportion z-test assumption is below:

Q: The gasoline price often varies a great deal across different regions across country X. The followin...

A: Objective: To test is there any significant difference in the mean price of gasoline for the three b...

Q: Suppose a population has a mean equal to 80 and a standard deviation equal to 6; also, suppose that ...

A: Population has a mean equal to 80 and a standard deviation equal to 6. i.e. µ=80 and σ=6, Random sam...

Q: The number of cartoons watched by Mrs. Kelly's first grade class on Saturday morning is shown below....

A: 0 0.15 0 0 0 1 0.20 0.2 1 0.2 2 0.30 0.6 4 1.2 3 0.10 0.3 9 0.9 4 0.20 0.8 16 3.2 5 0.05 0...

Q: Following are the fuel efficiency, in miles per gallon, for a sample of convertibles. Calculate the ...

A: Here, the sample size, n is 5. The mean is calculated below.   x¯=∑i=1nxin=25+26+21+20+215=1135=22.6...

Q: The length of a fully grown hibiscus plant has a mean 35cm. It is found that 5% of these plants are ...

A: Click to see the answer

Q: An investigation is carried out to determine whether face to face or virtual learning is more effect...

A: (1). Construct a pdf for both sets of data: Given data represents the scores of 12 students who took...

Q: Starbuck’s 2019 Annual Report shows the Sales growth across 2015-2019 is:   What is the average Am...

A: Since you have posted question with multiple sub-parts, we will solve first three sub-parts for you....

Q: The standard error used in calculating a 95% confidence interval for the difference in the average s...

A: Click to see the answer

Q: The national center for health statistics has found that there is a 5.01% chance that an american ci...

A: There is 5.01% chance that an American citizen will die from an accident.

Q: Suppose a local manufacturing company claims their production line has a variance of less than 9.0. ...

A: Solution: Given information: n =35 sample size  σ2= 9.0 Population Variances= 2.12 Sample standard d...

Q: In the manufacture of light emitting diode (LED), different layers of ink are on the optic lens. The...

A: A)  The estimated mean for the ink total thickness =μX1+X2 μX1+X2=μX1+μX2=0.1+0.23=0.33 The estimate...

Q: Please label each part.

A: Note- As per our policy we can answer only the first 3 sub-parts of a question. If you want solution...

Q: An internet service provider​ (ISP) has experienced rapid growth in the past five years. As part of ...

A: Sample mean = (288+333+281+308+311+343+305+289+284+386+358+330)/12 = 3816/12 = 318

Q: Case Study 13-1 A researcher believes that women today weigh less than in previous years. To investi...

A: Solution: Let X be the weight of the adult women. From the given information, x-bar=111 lbs, s=12.4 ...

Q: The Longmont Computer Leasing Company wishes to estimate the mean number of pages that will be print...

A: The margin of error for a confidence interval is gives by m=zσn, where z-score depends on the confid...

Q: IQ scores are normally distributed with a mean of 100 and standard deviation of 15. Find the IQ scor...

A: Let "X" be the IQ scores. Find z-value (z): Since the total area under the normal curve is 1. th...

Q: Describe the correlation whether a strong, a weak, or no. X and Y have ______ correlation. What is t...

A: Correlation is given by; r(X,Y)=Cov(X,Y)σxσy We need to first find Cov(X,Y) and the standard deviati...

Q: The claim is that for a smartphone​ carrier's data speeds at​ airports, the mean is μ=11.00 Mbps. Th...

A: Consider that μ defines the population mean smartphone carrier’s data speed at airport.   Null hypot...

Q: Use a normal distribution as an approximation to the binomial probability distribution to approximat...

A: Obtain the approximate probability of more than 13 successes in 20. The approximate probability of m...

Q: Dance Company Students The number of students who belong to the dance company at each of several ran...

A: The given data values are: 35,28,27,28,22,22,25,30,40,47,25,28,27,27,40,30. Sample mean: x=∑xn where...

Q: Which of the following are the assumptions for a one- sample t test?

A:   One sample t-test is used to determine if the sample mean is statistically different from a known,...

Q: Find the 90% confidence interval for the average shell length of all N. trivittata sea snails. What ...

A: Given: As the population standard deviation is not known, we will use t-distribution. The degrees...

Q: What is the sensitivity and specificity for each of the screening tool values? New Screening Too...

A: Sensitivity: The formula for sensitivity is obtained as given below: Sensitivity=Number of true posi...

Q: μ=70σ=5X = 74Z = 0.8 Based on the the z table, what percentage of people might start to show signs o...

A: Given, μ=70σ=5X=74z=0.8

Q: Bond Dollar price and interest Rate formula is: Interest rate(R) =Face Value - Initial Price/ Initia...

A: Click to see the answer

Q: Graeter’s is thinking about expanding its ice cream flavors. They have created three new flavors of ...

A: Hey, since there are multiple subparts posted, we will answer first three question. If you want any ...

Q: The time that it takes a randomly selected job applicant to perform a certain task has a distributio...

A: Given Information :  The time that it takes a randomly selected job applicant to perform a certain t...