Use a 0.05 significance level to test the claim that the different samples come from populations with the same mean. Use the traditional method.
Q: A statistical procedure in determining which hypothesis is more acceptable as true or which…
A: HERE USE basic hypothesis testing
Q: If the estimated power of a significance test is 0.6, it means that
A: The power of a significance test is basically the probability of not making type 2 error. The type 2…
Q: What does Statistical Significance implies?
A: Practical significance: The practical significance states that even if the treatment tested is…
Q: the
A: Effect size is defined as the way of quantifying the difference between the two groups.
Q: What is the procedure for determining the sample size necessary to estimate a population mean given…
A: The population mean CI for known population standard deviation is X¯± ( Zα2σn)where X¯=sample mean…
Q: Perform the analysis of variance (ANOVA) at the 5% significance level to identify is there any…
A: Excel Procedure: Enter the data for 1, 2, 3 in Excel sheet>Go to Data Menu>Click on Data…
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: The sample statistic that is unbiased estimator is:
A: Note:Hey there! Thank you for the question. However, you have not posted a complete question.…
Q: What are requirements for testing a claim about a population mean with a known?
A:
Q: What happens to the standard error of an estimate when the sample size in a SRS decreases?
A: Standard error: Standard error is a measure which explains how accurate are the sample means to…
Q: For a fixed sample size, what happens to the probability of a Type II error if the significance…
A: The sample size is fixed. The level of significance decreases from 0.05 to 0.01.
Q: Suppose that you want to compare the means of several populations, using independent samples. If…
A:
Q: What statistical procedure is best for the attached scenario and how will it answer the research…
A: Instruction : "What statistical procedure is best for the attached scenario and how will it answer…
Q: If a researcher decides to use the .10 level of significance rather than using the conventional.…
A: Relationship between Type I error, Type II error and level of significance: For small…
Q: Does the one observed sample mean qualify as a common or a rare outcome? Explain.
A: Sample mean qualify as a common outcome if the difference between the sample mean and the actual or…
Q: When should you use a one-way ANOVA to analyze your data? Distinguish between one–way ANOVA for…
A: ANOVA compares one or more population mean scores with each other on the basis of the sample data;…
Q: When is it appropriate to use a one-sample Z test and how is this value similar to a simple z or…
A:
Q: It is defined as the maximum likely difference between the observed sample mean and the true value…
A: Here Sampling Error is defined as the maximum difference between observed sample mean and…
Q: What is Two Related Samples?
A:
Q: To quantify the average discrepancy between sample means and population means, researchers compute
A: This part comes under estimator estimation
Q: What is the observed significance level for this test?
A: here given , n= 50 sample mean = 19.4 sample standard deviation = 3.1
Q: Explain one possible advantage of using a paired sample instead of independent samples.
A: Paired samples, are also known as dependent samples, can be defined as the samples in which natural…
Q: What are the steps for finding the relative frequency of sample means above or below a specified…
A: The sampling distribution of sample means is approximately a normal distribution because of the…
Q: Describe the difference between a two-sample (independent) t-test and an ANOVA (in terms of what…
A: Comparison of two sample t test and ANOVA
Q: Find the critical value for a test for correlation with a significance level of 10% and a sample…
A:
Q: If we would like to decrease the margin of error without changing the sample size, what must happen?
A: We have to find what to do to decrease margin of error.
Q: w is it used to conclude there is a statistically significant difference between the mean of…
A: The test which gives global assessment for statistical difference for 2 independent means called…
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 does it mean that a sample statistic is an unbiased estimator of a population parameter?
A: A statistic is called an unbiased estimator of a population parameter if the mean of the sampling…
Q: What is the population and sample of this study?
A: We want to know population and sample in given example.
Q: A mean is known as a statistic if it is computed from the: Opopulation. parameter. sample.
A:
Q: which of the best illustrates the distinction between statistical significance and practical…
A: Statistical significance: It consider that the observed results are unlikely under the assumption…
Q: What does it mean when sample results are not statistically significant?
A: statistically significant: In principle, a statistically significant result (usually a difference)…
Q: Show the difference between two approaches to significance testing?
A: The two approaches to significance testing are p-value approach and critical value approach.
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: What happens to the power of a hypothesis test if the significance level is decreased without…
A: Solution: It is required to mention what happens to the power of a hypothesis test if the…
Q: • When might a small sample size be appropriate in a study? •When is a very large sample size…
A: When the sample size is ideal then a sample size can be appropriate in a study. The ideal sample…
Q: The ANOVA procedure is a statistical approach for determining whether or not...
A:
Q: We use information about populations to make conclusions about our samples. * TRUE FALSE
A: Given statement : We use information about populations to make conclusions about our samples
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 the best thing to do when the result failed to meet statistical significance but had a…
A: Statistical significance of a result: It is used in the testing of hypotheses. To determine whether…
Q: When testing for the difference between the means of two dependent samples, the sample sizes are…
A: We have to find given statement is true or false.
Q: How does an observed sample mean qualify as a rare outcome?
A:
Q: The within subjects ANOVA may be used with
A: A one-way repeated measures ANOVA is used to determine whether three or more group means are…
Q: What does statistically significance indicates?
A: Statistical significance: If the chance of occurrence of an event is less than or equal to 5% then…
Q: What is Effect of Sample Size on standard error?
A: The standard error is also inversely proportional to the sample size; the larger the sample size,…
Trending now
This is a popular solution!
Step by step
Solved in 2 steps
- The accuracy of a coin-counter machine is gauged to accept nickels with a mean diameter of millimeters 21.21 mm. A sample of 38 nickles was drawn from a reported defective coin-counter machine located near a school. The sample had a sample mean of 21.214 mm and sample standard deviation 0.01 mm.Test the claim that the mean nickel diameter accepted by this coin-counter machine is greater than 21.21 mm. Test at the 0.1 significance level. (c) Using the Traditional method, the critical value is: (f) Based on your work above, choose one of the following conclusions of your test: The sample data supports the claim There is sufficient evidence to warrant rejection of the claim There is not sufficient evidence to warrant rejection of the claim There is not sufficient evidence to support the claim (g) Explain your choice in the box below.The accuracy of a coin-counter machine is gauged to accept nickels with a mean diameter of millimeters 21.21 mm. A sample of 38 nickles was drawn from a reported defective coin-counter machine located near a school. The sample had a sample mean of 21.214 mm and sample standard deviation 0.01 mm.Test the claim that the mean nickel diameter accepted by this coin-counter machine is greater than 21.21 mm. Test at the 0.1 significance level.(c) Using the Traditional method, the critical value is: (d) Based on your answers above, do you: Reject H0H0 Fail to reject H0H0 (e) Explain your choiceSales team of a New Ventures Company is in the process of introducing a new product. As an initial step company conducted a survey of prospective customers. Estimate how large a sample should company take if they want to estimate the proportion of people who will buy the product to within 3%, with 99% confidence. A researcher has taken a random sample of 8 observation from a normal population. Sample mean and standard deviations are 75 and 50 respectively. Using the 6 steps process of hypothesis testing. Can he infer at the 10% significance level that the population mean is less than 100? Can he infer at the 10% significance level that the population mean is less than 100 if population standard deviation is 50? Review the answers in (i) and (ii) and explain why the test statistics differed.
- A random sample of 100 private companies locating in Ankara was asked to rate on a scale from 1 (not important) to 5 (extremely important) for having the practical knowledge of statistics as a good job candidate. The sample mean rating was 4.7. a)Test at the 5% significance level the null hypothesis that the population mean rating is less than or equal to 4.5 against the alternative that it is greater than 4.5. Population variance is known as 0.6. b)Compute p-value and explain what the calculated p-value means.A coach wanted to know if aspiring junior tennis players are practicing more than 142 minutes each day. He sampled 20 of the players randomly and found their averagex ̅=147.47"min" and standard deviation s=22.26 min. a. Complete the hypothesis test at 0.05 level of significance, using the critical value method: H0: μ = 142 min H1: μ > 142 min b. What are the assumptions (or requirements) for this procedure? To receive full credits: Show all relevant information, including sample calculations, degree of freedom (if any), critical values, test statistic, etc. Show the steps on how to solve it. no excelA random sample of 154 recent donations at a certain blood bank reveals that 89 were type A blood. Does this suggest that the actual percentage of type A donations differs from 40%, the percentage of the population having type A blood? Carry out a test of the appropriate hypotheses using a significance level of 0.01. Calculate the test statistic and determine the P-value. (Round your test statistic to two decimal places and your P-value to four decimal places.)
- As part of a study to determine the effects of a certain oral contraceptive on weight gain, 12 healthy females were weighed at the beginning of a course of oral contraceptive usage. They were reweighed after 3 months. Do the results suggest evidence of weight gain? Use α = .05. State the null and alternative hypotheses Choose and state the appropriate statistical procedure (independent or paired t-test), for independent t-tests assume equal variances. Identify the level of significance and corresponding critical value Calculate t Express your results in terms of p-values (p < or p > α) Determine whether your results are significant State in one or two sentences your conclusions.Two independent samples from class 1 and class 2 are selected. Table 4 show the time in minutes it takes for 12 students from each class to complete answer the quiz is recorded. Data is not normally distributed. State the hypotheses for the test. Using nonparametric test, is there sufficient evidence to conclude that there is a difference in the time it takes for both classes to complete the exam? Use 5% significance level. Based on the answer from (b) if α = 0.01 , do you accept or reject the null hypotheses, why?A random sample of 796 subjects was asked to identify the day of the week that is best for quality family time. Consider the claim that the days of the week are selected with a uniform distribution so that all days have the same chance of being selected. The table below shows goodness-of-fit test results from the claim and data from the study. Test that claim using either the critical value method or the P-value method with an assumed significance level of α=0.05. Num Categories 7 Test statistic, χ2 2488.877 Degrees of freedom 6 Critical χ2 12.592 Expected Freq 113.7143 P-Value 0.000 All days of the week have an equal chance of being selected. At least one day of the week has a different chance of being selected. Identify the test statistic x2=___ (Type an integer or a decimal.) Identify the critical value. x2=___ (Type an integer or a decimal.) State the conclusion. (reject/fail to reject) H0. There (is not/is) sufficient evidence…
- A random sample of 154 recent donations at a certain blood bank reveals that 84 were type A blood. Does this suggest that the actual percentage of type A donations differs from 40%, the percentage of the population having type A blood? Carry out a test of the appropriate hypotheses using a significance level of 0.01.State the appropriate null and alternative hypotheses. Calculate the test statistic and determine the P-value. (Round your test statistic to two decimal places and your P-value to four decimal places.) z = P-value =Define critical p value. Explain what significance this value has for predicting the reproducibility of an experiment involving crosses. Explain why the null hypothesis is generally rejected for p values lower than 0.05.Identify the null hypothesis (, alternative hypothesis , test statistic, critical value(s), P-value (range of P-value), conclusion about the null hypothesis, and final conclusion that addresses the original claim. Assume that the two samples are independent simple random samples selected from normally distributed populations. Do not assume that the population standard deviations are equal. Use a 0.05 significance level to test the claim that the mean IQ score of people with low lead levels is greater than the mean IQ score of people with high lead levels. 2. Construct a confidence interval suitable for the testing the given claim. Low Lead Level High Lead Level n1 = 78 n2 = 21 x1= 92.88 x2 = 86.90 s1 = 15.34 s2 = 8.99