drawal symptoms may occur when a person using a painkiller suddenly stops using it. For a special type of painkiller, withdrawal symptoms occur in 2% of the cases. Consider a random sample of 1600 people who have stopped using the painkiller.

Q: Describe the procedures for obtaining a random sample. step by step

A:

Q: The margin of error increases if the sample size increases. True False

A: Margin of error is given by, MoE= z*sigma/√n  MoE is inversely proportional to n so as we increase…

Q: Imagine a study comparing two groups:  undergrad vs. graduate students in terms of stress level.  To…

A: Provided that here is a study comparing two independent groups :  undergrad vs. graduate students in…

Q: When the sample size is 15 and you are doing a t test, the number of degrees of freedom is 15. True…

A: Given that  Sample size n =15 Degree of freedom =df =n-1

Q: A sample of size 80 which found to contain 21 smokers. What is the sample proportion of non-smokers…

A: A population is the complete set of elements for which the study or experiment is conducted. A…

Q: Discuss the random sampling and the sampling distribution of the sample average?

A: Simple random sampling: A simple random sample of size n is collected from a large population where…

Q: Advertisers contract with Internet service providers and search engines to place ads on websites.…

A: Given data is appropriate for z-test for single proportion . because it is a large sample…

Q: Assume we do a simple random sample, where we have the same number of secondary units. Will cluster…

A: Since in the first case, the number of secondary units is the same, simple random sampling can be…

Q: what is a composite outcome rate in statistics?

A: Solution Composite outcomes, in which multiple end points are combined, are frequently used as…

Q: Based on past experience, a bank believes that 7% of the people who receive loans will not make…

A:

Q: Find the probability that mean of sample size 36 will be negative.

A:

Q: A random sample of 250 undergraduate students from a large university was found to contain 67…

A:

Q: Which do you think would have more variation: the GPA's of students in an honors college with a…

A: There are two cases: 1. the GPA's of students in an honors college with a prestigious university, 2.…

Q: What is a random sample?

A: Here use definition of random sample

Q: Past records indicate that 45% of students eat breakfast while driving to school. A campaign to…

A: Solution: State the hypotheses Null hypothesis: That is, the proportion of students eats breakfast…

Q: Define significance of Random sampling?

A:

Q: What proportion of the sample reported that they had been cyberbullied?

A: Givensample size(n)=14795No.of respondents say yes they had been cyberbullied(x1) = 2219No.of…

Q: When having random numbers what is used SURVEYS OR EXPERIMENTS?

A: Here's the explanation for this is as follows; Note that ,Experiment came from the Latin word…

Q: Two samples are randomly selected from

A: Failing to reject the Null hypothesis means accepting it and rejecting the alternative hypothesis.

Q: List the sample points for this experiment.

A: The total number of marbles in a box is N=6 Number of selected marbles n= 2 Then total number of…

Q: As the sample size increases, does the mean of the sampling distribution of sample mean increase?

A: According to law of large numbers, as sample size increases, the mean of sampling distribution is…

Q: What is the sample size of adults participated in this study?

A: We have to find the sample size for the given situation.

Q: Compute the sample correlation coefficient of neckline and waistline:

A: We have Given the Data of X=Neckline in cm Y=Waistline in cm  Correlation: It is the extent of…

Q: The process of random sampling guarantees that the sample selected will be representative of the…

A: Given: provided a statement

Q: With a paired-samples t test, you will usually compare the sample mean for the difference score to…

A: Paired t test: The mean of the same group at different times are compared. That is, sometimes…

Q: In simple random sampling, all samples of a given size are equally likely. Is that true in…

A:

Q: What does the sampling distribution of the mean allows determining?

A: Concept of sampling distribution of sample mean: Let a particular characteristic of a population is…

Q: If the sample size is increased, the margin of error will decrease.   True or False

A: Given statement : " If the sample size is increased, the margin of error will decrease "

Q: How many degrees of freedom does your sample contain?

A: Given that  Sample size=n=30 Formula for degree of freedom  df=n-1

Q: A doctor believer simple random sample of significance level of a Day Sunday Frequency 65

A:

Q: what is a sampling error?

A: Description of parameter and statistic:A characteristic that describes population is called a…

Q: What is the importance of getting a sample from a population? When and why is it necessary?

A: The population is defined as a large group in which the units involved have the same…

Q: A school board would like to determine whether there is a difference in average SAT scores for…

A: Paired data is used when experimental Unit is same on which two different treatment are apllied

Q: What is the probability that a sample size 7 out of 15 identified people will have a mean of weight…

A:

Q: What is sample size?

A: In this case, we need to define the sample size.

Q: Describe the definition of random sample

A: The random samples can be defined as the samples which are randomly selected from the population and…

Q: A survey on customer satisfaction at a bank is carried out by asking everyone who visits the bank on…

A: Sampling methods: In simple random sampling, all the units in the population have equal chance of…

Q: What is mean of the Sampling Distribution of the Mean?

A:

Q: Postpartum depression and anxiety (PPD), is a common medical condition affecting mothers and their…

A: Given X=20 n=101

Q: It is not important to collect samples randomly. True or false

A: Any sample must be collected using the random techniques. If the samples are not collected randomly…

Q: When is it appropriate to use a pooled sample test?

A: It is to determine when there is to use pooled sample test. There are some situation in testing we…

Q: You can reduce the risk of a Type I error by using a larger sample. True or False?

A: Type-I error: Type I error is rejecting the null hypothesis when the null hypothesis is actually…

Q: What is difference between random sampling and random assignment?

A:

Q: In almost all research studies, data are obtained from samples. A. True в. False

A: In almost all the research studies ,data are obtained from the samples  True  False

Q: If the probability of committing a Type I error for a given test is decreased, then for a fixed…

A: As probability of type I error decreases, probability of type I error increases.

Q: It is claimed that the mean household size in the River Terrace neighbourhood is 3.5 persons. A…

A: Test is that whether the mean household size in the River Terrace neighbourhood is 3.5.

Q: Could an author use a non-random/non-probability sampling to describe a population of 50,000? why or…

A: Non random sampling is a sampling technique where the probability of an individual selected in a…

Q: is statistics used to infer the results based on a sample to a population. *

A: Statistical inference consists in the use of statistics to draw conclusions about some unknown…

Q: Define random variations?

A: The question is about time series analysis Introduction : Time Series : It is a statistical…

2-Proportion Test

In a 2-proportion test, two separate proportions are measured at the same time, and their similarity is evaluated. It is also known as a 2-proportion z-test, and a comparison of two different proportions is done in this method.