To test H0: σ=1.4 versus H1: σ≠1.4​, a random sample of size n=21 is obtained from a population that is known to be normally distributed.

To test Ho: o = 4.6 versus H, : 0 4.6, a random sample of size n= 11 is obtained from a population that is known to be normally distributed. (a) If the sample standard deviation is determined to be s = 5.5, compute the test statistic. (b) If the researcher decides to test this hypothesis at the a = 0.01 level of significance, use technology to determine the P-value. (c) Will the researcher reject the null hypothesis? (a) The test statistic is x6 (Round to two decimal places as needed.) Enter your answer in the answer box and then click Check Answer. 2 parts remaining Clear All Check Answer

To test Ho: o = 2.1 versus H: 0+2.1, a random sample of size n = 17 is obtained from a population that is known to be normally distributed. (a) If the sample standard deviation is determined to be s = 1.8, compute the test statistic. = 11.755 (Round to three decimal places as needed.) (b) If the researcher decides to test this hypothesis at the a = 0.05 level of significance, determine the critical values. .2 The critical values are x6 025 and x6.975 %3D %3D (Round to three decimal places as needed.)

The null and alternate hypotheses are:   H0 : μ1 = μ2H1 : μ1 ≠ μ2   A random sample of 10 observations from one population revealed a sample mean of 23 and a sample standard deviation of 4. A random sample of 8 observations from another population revealed a sample mean of 26 and a sample standard deviation of 5. 1. Compute the pooled estimate of the population variance. (Round your answer to 3 decimal places.)

If the researcher decides to test this hypothesis at the = 0.05 level of significance, determine the critical value. The critical value are=_ and=_. Round to three decimal places as needed.

A population has parameters μ=37μ=37 and σ=54.8σ=54.8. You intend to draw a random sample of size n=209n=209.What is the mean of the distribution of sample means?What is the standard deviation of the distribution of sample means?(Report answer accurate to 2 decimal places.)

The scores of students on the SAT college entrance examinations at a certain high school had a normal distribution with mean μ=546.5μ=546.5 and standard deviation σ=28.9σ=28.9. (a) What is the probability that a single student randomly chosen from all those taking the test scores 550 or higher?ANSWER: For parts (b) through (d), consider a simple random sample (SRS) of 25 students who took the test. (b) What are the mean and standard deviation of the sample mean score x¯x¯, of 25 students?The mean of the sampling distribution for x¯x¯ is: The standard deviation of the sampling distribution for x¯x¯ is:  (c) What z-score corresponds to the mean score x¯x¯ of 550?ANSWER:  (d) What is the probability that the mean score x¯x¯ of these students is 550 or higher?ANSWER;

To test Ho: o=2.3 versus H1:0> 2.3, a random sample of size n= 15 is obtained from a population that is known to be normally distributed. Cormplete parts (a) through (d). (a) If the sample standard deviation is determined to be s=2.1, compute the test statistic. xổ =(Round to three decimal places as needed.) %3D (b) If the researcher decides to test this hypothesis at the a= 0.05 level of significance, determine the critical value. xo 05 = (Round to three decimal places as needed.) (c) Draw a chi-square distribution and depict the critical region. 11.67 23.69 6.571 23.685 11.67 23.69 (d) Will the researcher reject the null hypothesis? Click to select your answer(s). Chp

Consider a paint-drying situation in which drying time for a test specimen is normally distributed with o = 6. The hypotheses H,: µ = 74 and H: µ < 74 are to be tested using a random sample of n = 25 observations. (a) How many standard deviations (of X) below the null value is x = 72.3? (Round your answer to two decimal places.) 1.42 standard deviations (b) If x = 72.3, what is the conclusion using a = 0.004? 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 = State the conclusion in the problem context. O Do not reject the null hypothesis. There is not sufficient evidence to conclude that the mean drying time is less than 74. O Do not reject the null hypothesis. There is sufficient evidence to conclude that the mean drying time is less than 74. O Reject the null hypothesis. There is sufficient evidence to conclude that the mean drying time is less than 74. O Reject the null…

Consider a paint-drying situation in which drying time for a test specimen is normally distributed with o = 6. The hypotheses H: µ = 74 and H: µ < 74 are to be tested using a random sample of n = 25 observations. (a) How many standard deviations (of X) below the null value is x = 72.3? (Round your answer to two decimal places.) standard deviations (b) If x = 72.3, what is the conclusion using a = 0.004? 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.) p-value = State the conclusion in the problem context. O Do not reject the null hypothesis. There is not sufficient evidence to conclude that the mean drying time is less than 74. O Do not reject the null hypothesis. There is sufficient evidence to conclude that the mean drying time is less than 74. O Reject the null hypothesis. There is sufficient evidence to conclude that the mean drying time is less than 74. O Reject the null hypothesis.…