18. Suppose a researcher conducts a study on the relationship between hoursof exercise per week and grade point average at a certain university. To besure to get an equal number of men and women in the sample, theresearcher divides the population into men and women and then randomlyselects 200 men and 200 women for the study. What sampling techniquedid the researcher use?A. Simple Random SamplingProportional Stratified Random SamplingStratified Random SamplingВ.C.D.Convenience Sampling

Answered: Image /qna-images/answer/a6db5af5-d9b9-4078-83b6-3b29749300c5.jpg

Answered: 18. Suppose a researcher conducts a…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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arlneDetermine whether the samples are independent or related. 1. A police department wants to assess the effects of an obvious radar trap on the speeds of cars. Ten cars are randomly selected on a highway, and their speeds are measured just before a radar trap comes into view and right after they pass the obvious radar trap. 2. A company involved in a large volume of business by mail decides to test whether there is a difference in mail delivery between those items brought to a post office compared to those put in a corner mailbox. A random sample of 100 customers from the same city was selected, and their letters were mailed from the post office. Then another random sample of 100 customers was selected, but their letters were sent from the corner mailbox. The company measured how many days it took to deliver the letters for the two random samples. 3. Two formulations of a new whitening soap are compared to their whitening effect. A random sample of 40 potential users of the soap is…
1. You are trying to find the average weight of a breed of fish in a river. You catch the fish, collect the data, and then let it go in the river before your next catch. What type of sampling method are you using? Stratified sampling Cluster sampling Simple random sampling with replacement Simple random sampling without replacement
determine what type of sampling technique is used (Simple Random Sampling, Stratified Random Sampling, Systematic Sampling, Cluster Sampling, or Convenience Sampling). 5. A researcher wants to select ten students for a survey. Each student’s name is placed in a hat and 10 names are selected.
table 1 gives flight arrival numbers from a random sample of flights for airlines. Airline 1 early =133 on-time = 416+ late =150 total 699.. Airline 2 early =58 on-time =354 late =87 total =499. total early = 191 on-time =770 late =237 overall total =1198 . Test whether there is a difference between the two airlines in the percent of flights that arrive late. FIND THE RELEVANT SAMPLE PROPORTIONS IN EACH GROUP AND THE POOLED PROPORTION. P HAT 1= ? P HAT 2= ? P HAT = ? STATE THE NULL AND THE ALTERNATIVE HYPOTHESES? GIVE THE TEST STATISTIC AND THE P-VALUE?…
Match the name of the sampling method with the description of corresponding situation. Situations ask all the students in your math class pulling 50 names from a hat dividing the population that contains an equal number of men and women by Gender, and choosing 30 people of each gender randomly select four tables in the cafeteria and survey all the people at those four tables choosing every 5th person on a list Sampling Method b. PystematC d. Stratified e. Cluster
Three students want to estimate the mean pencil weight of their schoolmates.To do this, they each randomly chose 5 schoolmates and weighed their pencils. The samples are shown in the table.
Suppose the percentage of married couples who own a home is 33% for a given population. What is the standard error of the sampling distribution of proportions for the sample sizes n = 200, n = 300, and n = 400?
Independent random samples, each containing 70 observations, were selected from two populations. The
A school is interested in estimating the proportion of students who pass a math test for the classes 8, 9, and 10. The school decide to use stratified random sampling and treat each class as a stratum. The cost of sampling will not vary from stratum to stratum. The school believes that the proportion of students who pass the exam is 0.3 in each of the three classes ( strata). The school desire to estimate the proportion p with a bound of 0.1 on the error of estimation. Find the sample size n and the allocation that gives this bound. Where N 1 =200 , N 2 =150 , and N 3 =220 .
A simple random sample of 1000 observations is taken from a population of 10,000. What is the standard error of the sample mean?
18. Suppose a researcher conducts a study on the relationship between hours of exercise per week and grade point average at a certain university. To be sure to get an equal number of men and women in the sample, the researcher divides the population into men and women and then randomly selects 200 men and 200 women for the study. What sampling technique did the researcher use? A. Simple Random SamplingB. Proportional Stratified Random SamplingC. Stratified Random SamplingD. Convenience Sampling

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