The statistical software output for this problem is:
Hence,
a) Expected = 100
b) Test statistic = 80
c) Degrees of freedom = 3
d) Option A is correct.
Suppose there is a random sample of 400 observations, divided into four groups. The table below...
The following observations are from two independent random samples, drawn from normally distributed populations. Sample 1 9.74, 9.04, 8.06, 6.09, 7.51 Sample 2 |[25.96, 26,27, 26,34, 39.09, 33.88, 28.87, 33.46] We are interested in testing the null hypothesis that the two population variances are equal, against the one-sided alternative that the variance of Population 1 is larger than the variance of Population 2. Define Population 1 to be the population with the larger sample variance a) What are the appropriate...
a sample of 113 observations indicated that X1 is 71. A second sample of 157 observations indicated that X2 is 95. Conduct a z-test of hypothesis about a difference in population proportions using a 0.03 significance level. H0: p1 - p2 ≥ 0 H1: p1 - p2 < 0 a)State the decision rule.Reject H0 in favour of H1 if the computed value of the statistic is less than -1.88 or greater than 1.88.Reject H0 in favour of H1 if the computed value of the statistic is greater than 2.17.Reject H0 in favour of H1 if the computed...
A random sample of 100 observations from a population with standard deviation 63 yielded a sample mean of 111. Complete parts a through c. a. Test the null hypothesis that y 100 against the alternative hypothesis that > 100, using a 0.05. Interpret the results of the test. Ho is rejected Ho is not rejected O Interpret the results of the test. Choose the correct interpretation below. O A. There is sufficient evidence to indicate the true population mean is...
After randomly assigning subjects to treatments in a randomized comparative experiment, we can compare the treatment groups to see how well the randomization worked. We hope to find no significant differences among the groups. A study of how to provide premature infants with a substance essential to their development assigned infants at random to receive one of four types of supplement, called PBM, NLCP, PL-LCP, and TG- LCP. We are interested in whether the randomization results in equal proportions of...
An experiment consists of 400 observations and four mutually exclusive groups. If the probability of a randomly selected item being classified into any of the four groups is equal, then the expected number of items that will be classified into group 1 is
> 9.9, based on a random sample of 71 observations drawn from a Test the null hypothesis Ho: M=9.9against the alternative hypothesis HA: normally distributed population with Z = 4.1 and 0 = 0.89. a) What is the value of the test statistic? Give your response to at least 3 decimal places. Number b) What is the appropriate p-value? Give your response to at least 3 decimal places. Number c) Is the null hypothesis rejected at: i) the 10% level...
The data for a random sample of six paired observations are shown in the table a. Calculate and b. Express in terms of , and a c. Forma 99% confidence interval for d. Test the null hypothesis against the native hypothesis Us 0.01 Calculate the difference between each pair of observations by racing bein tromber (Round to two decimal places as needed) Calculates (Round to two decimal places as needed.) The data for a random sample of six paired observations...
The observations from a random sample of n = 6 from a normal population are: 13.15, 13.72, 12.58, 13.77, 13.01, 13.06. Test the null hypothesis of H0:μ=13 against the alternative hypothesis of H1:μ<13. Use a 5% level of significance. Answer the following, rounding off your answer to three decimal places. (a) What is the sample mean? (b) What is the sample standard deviation? (c) What is the test statistic used in the decision rule? (d) Can the null hypothesis be...
In order to compare the means of two populations, independent random samples of 400 observations are selected from each population, with the results found in the table to the right. Complete parts a through e below. Sample 1 overbar x = 5,305 s1= 154 Sample 2 overbar x = 5,266 s2 = 199 a. Use a 95% confidence interval to estimate the difference between the population means (mu 1 - mu 2). Interpret the confidence interval. The confidence interval is...
Given a random sample of 500 observations from a population having binomial distribution. Is there a significant evidence to conclude that population mean is greater than 300 if the sample mean is 302. a) Null hypothesis is b) Alternative is c) Test statistic equal to d) Critical Value of the test at a=10% is e) Does it appear at a=10% that population mean is greater than 300 ?