How do you transform the sample statistic (M, – Mo) into a test statistic (tobs)?

Q: How to Converting to z Scores is done?

A:

Q: Q3: What type of test statistic is needed?

A: Here given , muzzle velocities of eight shells tested with new gunpowder . So here n = 8

Q: A rowing team consists of five rowers who weigh 152, 159, 162, 150 and 156 pounds. Find all possible…

A: The formula for combination is nCr = n! / [r! (n – r)!] = [n (n – 1) … (n – r + 1)]/r!. Explanation:…

Q: How can the sample covariance be used to estimate the covariance of random variables?

A: The covariance is used to measure the relationship between two random variables, that is, to what…

Q: What information do you need to decide on a sample size that will provide adequate statistical…

A: Adequate statistical power is the power of probability with the rejected null hypothesis. Generally,…

Q: What are the three t tests for population means?

A:

Q: What is formula for variance for sample?

A: Variance measures absolute variability in a data set, calculated with respect to the mean. That is,…

Q: We need first to determine the degrees of freedom before we could calculate the sample mean True…

A: The sample mean is defined as Mean = Sum of sample observations/Sample size

Q: State two differences between a cluster sample and a stratified random sample in this situation.

A: Sampling:      The Sample is a subset of the Population, where a sample is extracted from a…

Q: What is it meant by the term “parameter of a population”? Explain why a population can be…

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Q: Explain the situations of independent samples t-test vs. paired-sample t-test?

A: Independent samples t-test vs. paired-sample t-test.

Q: When is it appropriate to use a one-sample Z test and how is this value similar to a simple z or…

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Q: what is the z score formula and and reverse z score formula ?

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Q: Explain ways in which we use the independent sample t-test vs. paired sample t-test?

A: Independent sample t-test vs. paired sample t-test

Q: rationale for using n – 1 to compute the sample variance

A: we divide by 'n' to get the population variance.

Q: What is the key difference between an independent and a dependent samples t-test?

A: Solution-: What is the key difference between an independent and a dependent samples t-test?

Q: What is the difference between the computational formula and the defining formula of a sample…

A: It is an important part of statistics. It is widely used.

Q: What test can we use to determine the sample size needed?

A: Confidence intervals for a parameter take the following general form: Point Estimate ± Margin of…

Q: Which statistical test should she conduct?

A: We need to identify suitable statistical test for given situation

Q: What is the formula for statistical power and Type 11 error

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Q: Suppose that you have obtained data by taking a random sample from a population. Before performing a…

A: For a random sample that is selected from a population, the following steps have to be done in order…

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: What are the six steps to statistical testing? Explain Each step.

A: The six steps in hypothesis testing.

Q: how do you find random sample of 20 "items" from some population or process? And make the table with…

A: To find a random sample of size 20 from a population, we use simple random sampling. The simple…

Q: when we are performing a hypothesis testing for a population mean, if the sample size is small, what…

A: For hypothesis testing of the population mean of the small samples (<30) t-statistic is used.…

Q: What are thw two requirements for a random sample?

A: In this case, we need to write the two requirements for the random sample.

Q: use a sample to draw an inference about a population

A: The population is a set of all the possible observations about a specified characteristic of…

Q: Explain Sampling Distribution of a Sample Mean and how does it affect the parameters and random…

A: We have to ask about sampling distribution of a sample mean : And how it affects the parameters.

Q: The sample suggests that the food is safe, but it actually is not safe. type I O type II O not an…

A: Type I error (α) is the probability of rejecting the null hypothesis when it is actually true. Type…

Q: What are the conditions to satisfy to conduct a one-sample t-test for the population mean

A: Determine the conditions that used to satisfy to conduct the one-sample t-test for the population…

Q: What are the six steps to inferential statistical testing? Explain Each step.

A: Solution-: We want to fin six steps to inferential statistical testing?

Q: In a paired samples t test, explain the logic of difference scores (why do you need to find them to…

A: PAIRED T-TEST: The paired t test is also defined as dependent- t test.  This test is used to test…

Q: Why do you need to know the sampling distribution of the difference between two sample means in…

A: In this case, we need to find the reason for identifying the sampling distribution of the difference…

Q: What is test statistics and p value

A: Introduction: Denote μ as the true mean change in LDL cholesterol level among individuals treated…

Q: explain why two parameters are used in a two sample test

A: Here in the two parameters we take in two sample t-test because, we take samples from two…

Q: Define probability of obtaining a sample statistic?

A:

Q: What is the best point estimate for the population's variance if the sample variance is 41?

A: Given,sample variance(s2)=41

Q: In a paired samples t test, explain the logic of difference scores (why do you need to find them to…

A: Paired t test:The paired t test is also defined as dependent- t test. It is used to test the mean…

Q: How do I find a pooled variance of 2 sample groups?

A: There are two sample groups.

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: A rowing team consists of five rowers who weigh 152, 159, 162, 150 and 156 pounds. Find all possible…

A: Given: Weights of five rowers- 152,159,162,150,156 Sample size, n=3

Q: What is a paired sample t-test used for?

A:

Q: Explain the four steps involved in significance testing?

A: Hypothesis testing can be conducted in two ways: Critical value approach. P-value approach. The…

Q: What is the standard error of the sample mean if your sample size is 36? Give your answer to 2…

A: It is given that  Population standard deviation, σ = 4.8 Sample mean, x̅ = 25.9 Sample standard…

Q: A drug company is testing a new pain relief. They select 100 arthritics. Patient and conduct a…

A:

Q: Identify the two factors that determine the persuasiveness of evidence.How are these two factors…

A: Let P denote persuasiveness. Let E denote evidence. Let AP denote audit procedures. Let n denote…

Q: (4) Are the population mean and variance random variables? Why? Are the sample mean and variance…

A: Note: Hi! Thank you for the question. As questions 4 and 5 are independent questions, according to…

Q: The process of using sample statistics to make conclusions about population parameters is called…

A: In statistics, the population consists of the entire set of entities that are under study, whereas a…

Types of Bias

Statistics is the study of data collection, organization, analysis, interpretation, and presentation. Statistical bias is a characteristic of a statistical technique or its findings in which the expected value deviates from the actual root quantitative parameter being estimated. According to the actual definition of bias, it refers to the tendency of a statistic to overestimate or underestimate a parameter.