! please solve all parts 5) Suppose the p-value that comes with Stata is 0.2758 and the tstat is -1.09. The p-value willif we had the same conjecture as Stata has, but now it is a right tailedbetest? Assume N is large enough, so that it is a zstat.You need to look up z6) If the zstattables for this-2.41, p-value for a two tailed test isYou need to look up z7) If the zstat = -2.41, p-value for a right tailed test istables for this.8) If the zstat=-2.41, p-value for a left tailed test isfor this.You need to look up z tables

We are usi z table for finding corresponding p values

Answered: 5) Suppose the p-value that comes with…

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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1. A researcher computes r = .45 using a sample of 18participants. What is the decision for a Pearsoncorrelation coefficient for a two-tailed test at a .05significance level? A Fail to reject the null hypothesisB Reject the null hypothesisC Not enough information
One sample of n=15 students spent one hour studying material from an e-book and then were tested on the material; their mean is = 79 with = 25. A second sample of n=15 students spent one hour studying the same material from a hard copy of the text, and then earned a mean of = 83 with = 23. Run a two-tailed hypothesis test with alpha = .05. Write the alternative hypothesis. Write the null hypothesis. With α=.05, what is tcrit? Compute tobt What should the researcher conclude?
A research center claims that 29% of adults in a certain country would travel into space on a commercial flight if they could afford it. In a random sample of 800 adults in that country, 31% say that they would travel into space on a commercial flight if they could afford it. At a=0.05, is there enough evidence to reject the research center's claim? Complete parts (a) through (d) below. (a) Identify the claim and state H0 and Ha. Identify the claim in this scenario. Select the correct choice below and fill in the answer box to complete your choice. (Type an integer or a decimal. Do not round.) A. The percentage of adults in the country who would travel into space on a commercial flight if they could afford it is not ______%. B. No more than ______% of adults in the country would travel into space on a commercial flight if they could afford it. C. ______% of adults in the country would travel into space on a commercial flight if they could afford it. D. At least ______% of…
A doctor used to believe that babies were equally likely to be born any day of the week, but with the rise in scheduled deliveries, the doctor now claims that babies are twice as likely to be born on a weekday (Monday through Friday) than on a weekend (Saturday and Sunday). She decides to test: Ha: Not all of the pi’s are as stated. She selects a random sample of 120 babies born this year and determines on which day of the week they were born. She finds that 4 were born on Sunday, 24 on Monday, 21 on Tuesday, 18 on Wednesday, 22 on Thursday, 28 on Friday, and 3 on Saturday. The chi-square test statistic for goodness of fit is χ2 = 12.95 and the P-value is between 0.025 and 0.05. The doctor had hypothesized that babies are twice as likely to be born on a weekday (Monday through Friday) than on a weekend (Saturday and Sunday). Because the P-value is less than 0.05 the doctor rejects the null hypothesis. She completes a follow-up analysis. Here is a table of the observed counts, the…
A doctor used to believe that babies were equally likely to be born any day of the week, but with the rise in scheduled deliveries, the doctor now claims that babies are twice as likely to be born on a weekday (Monday through Friday) than on a weekend (Saturday and Sunday). She decides to test: Ha: Not all of the pi’s are as stated. She selects a random sample of 120 babies born this year and determines on which day of the week they were born. She finds that 4 were born on Sunday, 24 on Monday, 21 on Tuesday, 18 on Wednesday, 22 on Thursday, 28 on Friday, and 3 on Saturday. The chi-square test statistic for goodness of fit is χ2 = 12.95 and the P-value is between 0.025 and 0.05. What conclusion should she make? Use a = 0.05. Reject H0. There is convincing evidence that babies are twice as likely to be born on a weekday (Monday through Friday) than on a weekend (Saturday and Sunday). Reject H0. There is convincing evidence that babies are not twice as likely to be born on a…
This is a two-tailed test, so we are concerned about the critical values that give a total area of 0.05 in both the upper and lower tails. Therefore, each tail will have an area equal to half of 0.05, or 0.025. Any test statistic greater than or equal to the positive critical value or less than or equal to the negative critical value will result in the null hypothesis being rejected. An excerpt of the t table with 57 degrees of freedom is given below. Degreesof Freedom Area in Upper Tail 0.20 0.10 0.05 0.025 0.01 0.005 57 0.848 1.297 1.672 2.002 2.394 2.665 Move along the row for 57 degrees of freedom until reaching the column corresponding to an upper tail area of 0.025. This value of t will be the positive critical value. Find this value, rounding the results to three decimal places. t = The second critical value will be the opposite sign of the positive one just found. Therefore, the critical values for the rejection rule, to three decimal places, are as follows. test…
A psychologist specializing in marriage counseling claims that, among all married couples, the proportion p for whom her communication program can prevent divorce is at least 75%. In a random sample of 225 married couples who completed her program, 161 of them stayed together. Based on this sample can we reject the psychologists claim at the 0.05 level of significance? Perform a one tailed test, and complete the parts below.
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1. A researcher used a sample of n =16 adults between the ages of 40 and 45. For each person, the researcher recorded the difference between the ratings obtained while smiling and the rating obtained while frowning. On average the cartoons were rated as funnier when the participants were smiling, with an average difference of MD = 1.6, with SS = 135. Are the cartoons rated as significantly funnier when the participants are smiling ? Use a one-tailed test with α = .05. The null hypothesis in words is: Group of answer choices There is no significant difference between the two conditions: smiling and frowning There is a significant difference between the two conditions: smiling and frowning The cartoons were not rated as significantly funnier when the participants were smiling than when the participants were frowning. The cartoons were rated as significantly funnier when the participants were smiling than when the participants were frowning. 2. The alternative hypothesis in…
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In a two-tailed test, with α=0.01 , and N is 41. b) Is the tobt of +4.0 of significant?
Consider the next 1,000 95% CIs for \mu that a statistical consultant will obtain for various clients. Suppose the data sets on which the intervals are based are selected independently of one another. What is the probability that between 940 and 960 of these intervals contain the corresponding value of \mu?

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