From the resulted chi square value & degrees of freedom

Q: Why does z-test is being used when the sample size is large(> 30) and t-test when the sample size is…

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Q: After a sample of n = 25 high school students took a special training course, their SAT scores…

A: a. Let μD be the population mean difference, the test is that the training course has a significant…

Q: Is the proportion of wildfires caused by humans in the south different from the proportion of…

A: Given X1=372 X2=397 n1=n2=526

Q: a) Carry out a Chi-square test, and give the P-value, and state your conclusion using 5% threshold…

A: Given: α=0.05   1-3 hrs 4-6 hrs 7-9 hrs Total Community college students 110 99 48 257 4-year…

Q: What would be the obtained z-score if the IQ SCORES in the examples are computed using the standard…

A: The IQ scores using Standard binet test are  105 104 90 86 102 100 85 93 98 97…

Q: Does this study provide convincing evidence that the percentage of those with diabetes who undergo…

A: Given: Sample size n = 82 patients x = Number of patients recovered = 59 P = 62% = 0.62 2 tailed…

Q: Select all the answers that are associated with the p value Type I error alpha significance level…

A: P-value : P-value is a statistical measurement used to validate a hypothesis against a observed…

Q: samples of 500 persons each, and using the 0.01 level of significance, can we conclude that the…

A: It is given that For conventional PC, sample size n1 = 500, sample proportion = 0.80 For touchscreen…

Q: What is the p-value for a two-tailed test with z=2.04? (Use 4 decimal places) I plugged in z = 2.04…

A: Given two tailed test with Z = 2.04. and level of significance = 0.05.In two tail test the p value…

Q: Below is a table that shows samples of computed p values and the corresponding level of…

A: Decision rule is that the null hypothesis is rejected if p-value is less than or equal to the…

Q: A chi-square test for homogeneity was conducted to investigate whether the four high schools in a…

A: Given:  p-value of the test = 19.02 and 0.025

Q: Is there enough evidence, at a a = 0.01 level of significance, to show a difference between the…

A: The provided sample means are shown below: Xˉ1=578\bar X_1 = 578 Xˉ2=570\bar X_2 = 570 Also, the…

Q: 4. Why do you think most journals will not publish papers with an alpha = 0.1 ? Explain your answer…

A: Level of significance: The probability of type I error, α, is known as the level of significance of…

Q: For a lower tail hypothesis test with a sample size of 13 and a .10 level of significance, the…

A: From the provided information, Sample size (n) = 13 Level of significance (α) = 0.10 The test is…

Q: In this study, the protection of aquatic ecosystems is an important goal of Ville de Montréal. In…

A: 13) a. Hypothesis: The null and alternative hypotheses are below: H0: There is no difference in the…

Q: The HSD test? A.  maintain the type 1 error, b. maintains the type 1 error rate at alpha and is used…

A: Introduction: The HSD or honestly significant difference test is a multiple comparisons test, often…

Q: a. Assuming the customary 1.5o shift in the process mean, a manufacturing factory is operating at…

A: Six Sigma.: Products with many components typically have many opportunities for failure or defects…

Q: What is an alpha level? What is a p-value level? how is a p-value used in relation to an alpha level…

A: Alpha Level: The alpha level is defined as the probability of rejecting the null hypothesis when the…

Q: A computer manufacturer believes that the proportion of hardware malfunctions is different in humid…

A: Given, The manufacturer takes a random sample of 400 machines sold in Florida (humid) and 400…

Q: A new virus has taken root in a country. Government officials are reporting that 14.8% of the…

A: Given data  X = 186 N = 1100 Alpha = 0.05 P= 14.8%.  = 0.148

Q: Compute the value of the chi-square test statistic.

A: Given,   Course Personal Work total Male 5 6 8 19 Female 6 8 3 17 total 11 14 11 36

Q: A computer manufacturer believes that the proportion of hardware malfunctions is different in humid…

A: Given Information: Claim: proportion of hardware malfunctions is different in humid climates than in…

Q: Is there evidence that the visual reaction time tends to be slower than the auditory reaction time?…

A: a) We will use paired t test in this problem since it is designed to compare the means of the same…

Q: 4.1 At the 0.05 level of significance, test whether the mean fat absorbed by the four different fats…

A: As per the honor code, We’ll answer the first question since the exact one wasn’t specified. Please…

Q: What are some assumptions researchers may have about a related-samples t-test?

A: Correlated samples t-test or matched pairs t-test or repeated measures t-test: The paired t-test or…

Q: Determine the P-value and decide whether at the 5% significance level, the data provide sufficient…

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Q: A researcher samples 5 colony of Species of K and 5 colonies of Species L, measures their sizes as:…

A: Note: Hi there! Thank you for posting the question. As each part of the question is different, we…

Q: Out of an F test, Chi-squared t test, Two sample t test, and an One sample t test, the best test to…

A: We have to answer the question of, out of F test, Chi squared test, Two sample t test and an One…

Q: Use the pulse rates beats per minute (bpm) of a random sample of adult females listed in the data…

A: We have find givan hypothesis...

Q: How many samples should be selected when the total population is 31 for goldfeld and quandt test to…

A: Goldfeld Quandt test for heteroskedasticity requires to divide the data set (population or sample)…

Q: greater than the average age for wives? (Statkey: Use Descriptive Statistics for Two Quantitative…

A: * ANSWER :-    From the given information the answer is given below as ,  (1)

Q: You are asked to design a study to investigate the effectiveness of the Atkins diet (IV = diet, DV =…

A: Consider the population of all individuals in a particular city. A random sample of 40 individuals…

Q: A study of scat belt users and nonusers yielded the randomly selected sample data summarized in the…

A: Note: Since part A is only posted. The answer will be given for the posted question. Please provided…

Q: Although the chi-square homogeneity test and the chi-square independence test use essentially the…

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Q: 800 randomly selected automobile owners were asked the main reason why they had bought their current…

A: hypothesis  null hypothesis : there is no significant difference between automobile and gender…

Q: A factorial experiment was designed to determine factors in a high-energy electron beam process that…

A: Given information: The two factors of the study are Factor-A = Travel Speed and Factor-B =…

Q: What would be the minimum sample size for an independent samples t-test with a small effect size…

A: Formula for sample size:

Q: Given the SPSS output: (a) Test the null hypothesis of no difference in the true mean amount of…

A: Solution: a) To test the hypothesis  Ho:μ1=μ2=μ3=μ4= 0       VS     Ha: μi≠0  for at least one…

Q: We found no difference on the reported self-esteem level between female participants (M=5.39, SD =…

A: As per our guidelines, we are allowed to answer first three sub-pats only. Thanks   What was the…

Q: Can you help me solve these 3 questions using Statcrunch? please and thank you! Identify the null…

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Q: Perform a chi-square independence test, provided the conditions for using the test are met.…

A: Chi-square Analysis: For assessing categorical data from a randomly selected sample, the statistical…

Q: 1. Conduct a two-sample t-test at a 1% level of significance to find out if the U.S. stock returns…

A: The formula for degrees of freedom is df=S12n1+S22n22S12n12n1-1+S22n22n2-1.

Q: The Durbin-Watson statistic is based on the

A: The Durbin-Watson statistic is used to check whether the autocorrelation present in residuals or…

Q: Consider the two sample t-test with equal variances and the paired t-test. These tests are…

A: Two sample t-tests: The two-sample t-test is used when the two samples are statistically independent…

Q: to own small dogs for companionship and 11 out of 30 women chose to own large dogs for…

A: It is required to test whether the proportion of women who prefer small dogs for companionship…

Q: A major credit card company is investigating whether the distribution of the number of credit cards…

A: From the provided information, The chi square value = 7.82 The corresponding p value = 0.02 The…

Q: A small pilot study is run to compare a new drug for chronic pain to one that is currently…

A: Null Hypothesis:    H0:  There is no difference in the self-reported improvement in pain.…

Q: Justify the choice of test procedure. b) Can a student's t-test on paired samples be used as a test…

A: Test is that whether the quality of life of patients before and after the treatment is same. Given…

Q: Five samples of a ferrous-type substance were used to determine if there is a difference between a…

A: In the given situation, the alternative hypothesis is not equal case. That is, the tail of the test…

Confidence Intervals

When we calculate intervals in probability and statistics, it can be simply termed as finding out a confidence interval. The confidence interval is usually calculated from the data set which is observed. The value of the parameter that needs to be calculated is present here only.