The amount of lateral expansion (mils) was determined for a sample of n = 8 pulsed-power...

The amount of lateral expansion (mils) was determined for a sample of n = 8 pulsed-power gas metal arc welds used in LNG ship containment tanks. The resulting sample standard deviation was s = 2.82 mils. Assuming normality, derive a 95% CI for σ² and for σ. (Round your answers to two decimal places.)

CI for σ²

(_______,_______)mils²

CI for σ

(_______, _____) mils

Expert Solution

orchestra answered 1 year ago

The amount of lateral expansion (mils) was determined for a sample of n = 6 pulsed-power...

The amount of lateral expansion (mils) was determined for a sample of n = 6 pulsed-power gas metal arc welds used in LNG ship containment tanks. The resulting sample standard deviation was s = 2.81 mils. Assuming normality, derive a 95% CI for σ2 and for σ. (Round your answers to two decimal places.) CI for σ2 ( __________ , __________ ) mils2 CI for σ ( __________ , __________ ) mils2

The amount of lateral expansion (mils) was determined for a sample of n = 9

The amount of lateral expansion (mils) was determined for a sample of n = 9 pulsed-power gas metal arc welds used in LNG ship containment tanks. The resulting sample standard deviation was s = 2.84 mils. Assuming normality, derive a 95% CI for ?2 and for ?. (Round your answers to two decimal places.)

A sample contained a mixture of BaCO3 and MgCO3. The amount of BaCO3 was determined by...

A sample contained a mixture of BaCO3 and MgCO3. The amount of BaCO3 was determined by reacting 10.53 g of the sample with an excess of HCl to release CO2 from each compound; BaCO3(s) + 2 HCl(aq) --> BaCl2 + CO2(g) MgCO3(s) + 2 HCl(aq) --> MgCl2 + CO2(g) If the sample reacted completely and produced 2230 mL of carbon dioxide at 30.86 °C and 738.2 mm Hg, what was the mass percentage of BaCO3 in the mixture?

n a random sample of 38 criminals convicted of a certain crime, it was determined that...

n a random sample of 38 criminals convicted of a certain crime, it was determined that the mean length of sentencing was 70 months, with a standard deviation of 5 months. Construct and interpret a 95% confidence interval for the mean length of sentencing for this crime.

Suppose for a population, ? = 45, ? = 8. A sample of size n =...

Suppose for a population, ? = 45, ? = 8. A sample of size n = 31 is selected. a) What is the standard deviation of sample mean? i.e. ?([?(x)]) = b) What is the z-score of [?(x)] = 41.5? c)If the sample standard deviation is s = 9, what is the standard error of sample mean? i.e. s.e.([?(x)]) = d)If the sample standard deviation is s = 9, what is the t-score of [?(x)] = 41.5?

The scores of a physics test of a random sample of students (n = 8) are...

The scores of a physics test of a random sample of students (n = 8) are listed below. Is the sample significantly different from m = 65? State the null and alternative hypotheses Set the criteria for a decision: two-tailed test with a = .05 Compute the test statistic using SPSS What is the effect size (you will need to compute Cohen’s d from data given in the SPSS output table) d= M- μ / (SD) (5 pts) Write the...

Find the sample size n needed to achieve power 0.8 at EY = 5, for the...

Find the sample size n needed to achieve power 0.8 at EY = 5, for the test in question one at level ⍺ = 0.05. n = _____. Question one for reference: 1. For testing H0: EY = 3 vs H1: EY > 3, based on a sample Y: 1,3,5,7,9, assume that var(Y) = 4 is known. The p-value is _____. (Correct answer to question one: 0.01267366)

Assume that you have a sample of n 1 equals 8, with the sample mean Xbar1...

Assume that you have a sample of n 1 equals 8, with the sample mean Xbar1 equals 50, and a sample standard deviation of S1 equals 7, and you have an independent sample of n2 equals 15 from another population with a sample mean of Xbar2 equals 33, and the sample standard deviation S2 equals 5. Construct a 95% confidence interval estimate of the population mean difference between mu 1 and mu 2. Assume that the two population variances are...

Assume that you have a sample of n 1 equals 8, with the sample mean Upper...

Assume that you have a sample of n 1 equals 8, with the sample mean Upper X overbar 1 equals 42, and a sample standard deviation of Upper S 1 equals 4, and you have an independent sample of n 2 equals 15 from another population with a sample mean of Upper X overbar 2 equals 34 and a sample standard deviation of Upper S 2 equals 5. What assumptions about the two populations are necessary in order to perform...

Assume that you have a sample of n 1 equals 8n1=8, with the sample mean Upper...

Assume that you have a sample of n 1 equals 8n1=8, with the sample mean Upper X overbar 1 equals 45X1=45, and a sample standard deviation of Upper S 1 equals 7S1=7, and you have an independent sample of n 2 equals 17n2=17 from another population with a sample mean of Upper X overbar 2 equals 31X2=31, and the sample standard deviation Upper S 2 equals 5.S2=5. Construct a 99% confidence interval estimate of the population mean difference between mu...

Question