 Recent questions in Post Secondary CoormaBak9 2020-10-25 Answered

Let B and C be the following ordered bases of $$\displaystyle{R}^{{3}}:$$ $$B = (\begin{bmatrix}1 \\ 4 \\ -\frac{4}{3} \end{bmatrix},\begin{bmatrix}0 \\ 1 \\ 8 \end{bmatrix},\begin{bmatrix}1 \\ 1 \\ -2 \end{bmatrix})$$ $$C = (\begin{bmatrix}1 \\ 1 \\ -2 \end{bmatrix}, \begin{bmatrix}1 \\ 4 \\ -\frac{4}{3} \end{bmatrix}, \begin{bmatrix}0 \\ 1 \\ 8 \end{bmatrix})$$ Find the change of coordinate matrix I_{CB} CheemnCatelvew 2020-10-25 Answered

If $$\displaystyle{n}={110}$$ and $$\displaystyle\hat{{{p}}}$$ (p-hat) $$\displaystyle={0.66}$$, construct a $$\displaystyle{95}\%$$ confidence interval. Give your answers to two decimals $$\displaystyle?{<}{p}{<}?$$ cistG 2020-10-25 Answered

A normal population has mean $$\displaystyle\mu={20}$$ and standard deviation $$\displaystyle\sigma={4}$$. What proportion of the population is less than 18? Efan Halliday 2020-10-25 Answered

A population of values has a normal distribution with $$\displaystyle\mu={120.6}$$ and $$\displaystyle\sigma={48.5}$$. You intend to draw a random sample of size $$\displaystyle{n}={105}$$. Find the probability that a sample of size $$\displaystyle{n}={105}$$ is randomly selected with a mean greater than 114.9. $$\displaystyle{P}{\left({M}{>}{114.9}\right)}=$$? Write your answers as numbers accurate to 4 decimal places. Globokim8 2020-10-25 Answered

A population of values has a normal distribution with $$\displaystyle\mu={239.5}$$ and $$\displaystyle\sigma={32.7}$$. You intend to draw a random sample of size $$\displaystyle{n}={139}$$. Find the probability that a sample of size $$n=139$$ is randomly selected with a mean greater than 235.9. $$\displaystyle{P}{\left({M}{>}{235.9}\right)}=$$? Write your answers as numbers accurate to 4 decimal places. Dolly Robinson 2020-10-25 Answered

Create a 2nd order, homogeneous, linear IVP, that is not guaranteed to have a unique solution at $$x_0=3$$ iohanetc 2020-10-25 Answered

Find the sum of the given vectors $$\displaystyle{50}{N}\angle{320}^{\circ}+{170}{N}\angle{150}^{\circ}$$ $$Rx = ?$$ $$Ry = ?$$ $$R = ?$$ $$\theta = ?$$ Nann 2020-10-25 Answered

Is $$Z_{3}\ \oplus\ Z_{9},$$ isomorpbic to $$Z_{27}?$$ Decide and answer why exactly? illusiia 2020-10-25 Answered

Solve differential equation $$dy/dx = e^4x(y-3)$$ sagnuhh 2020-10-25 Answered

Solve. $$\displaystyle\int\frac{{\sqrt{{x}}}}{{{1}+{\sqrt[{{3}}]{{x}}}}}{\left.{d}{x}\right.}=?$$ Isa Trevino 2020-10-23 Answered

Let F be a field. Prove that there are infinitely many irreducible monic polynomials Mylo O'Moore 2020-10-23 Answered

Write down a definition of a subfield. Prove that the intersection of a set of subfields of a field F is again a field Jaya Legge 2020-10-23 Answered

Researchers wanted to compare the effectiveness of a water softener used with a filtering process with a water softener used without filtering. Ninety locations were randomly divided into two groups of equal size. Group A locations used a water softener and the filtering process, while group B used only the water softener. At the end of three months, a water sample was tested at each location for its level of softness. (Water softness was measured on a scale of 1 to 5, with 5 being the softest water.) The results were as follows: Group A (water softener and filtering) $$\displaystyle{x}_{{1}}={2.1}$$ $$\displaystyle{s}_{{1}}={0.7}$$ Group B (water softener only) $$\displaystyle{x}_{{2}}={1.7}$$ $$\displaystyle{s}_{{2}}={0.4}$$ Determine, at the 90% confidence level, whether there is a difference between the two types of treatments. Tabansi 2020-10-23 Answered

Evaluate the following integrals. $$\displaystyle\int{\frac{{{\left.{d}{x}\right.}}}{{\sqrt{{{\left({x}-{1}\right)}{\left({3}-{x}\right)}}}}}}$$ Line 2020-10-23 Answered

Trust Fund A philanthropist deposits \$5000 in a trust fund that pays 7.5% interest, compounded continuously. The balance will be given to the college from which the philanthropist graduated after the money has earned interest for 50 years. How much will the college receive? facas9 2020-10-23 Answered

A population of values has a normal distribution with $$\displaystyle\mu={116.3}$$ and $$\displaystyle\sigma={27.5}$$. You intend to draw a random sample of size $$\displaystyle{n}={249}$$. Find the probability that a single randomly selected value is greater than 117.3. $$\displaystyle{P}{\left({X}{>}{117.3}\right)}=$$? Write your answers as numbers accurate to 4 decimal places. bobbie71G 2020-10-23 Answered

Identify the variable being measured. postillan4 2020-10-23 Answered

Differentiate between univariate, bivariate and multivariate data. illusiia 2020-10-23 Answered

Find the inverse Laplace transform of $$\frac{6s+15}{(s^2+25)}$$ $$s>0$$ postillan4 2020-10-23 Answered

A random sample of $$\displaystyle{n}_{{1}}={16}$$ communities in western Kansas gave the following information for people under 25 years of age. $$\displaystyle{X}_{{1}}:$$ Rate of hay fever per 1000 population for people under 25 $$\begin{array}{|c|c|} \hline 97 & 91 & 121 & 129 & 94 & 123 & 112 &93\\ \hline 125 & 95 & 125 & 117 & 97 & 122 & 127 & 88 \\ \hline \end{array}$$ A random sample of $$\displaystyle{n}_{{2}}={14}$$ regions in western Kansas gave the following information for people over 50 years old. $$\displaystyle{X}_{{2}}:$$ Rate of hay fever per 1000 population for people over 50 $$\begin{array}{|c|c|} \hline 94 & 109 & 99 & 95 & 113 & 88 & 110\\ \hline 79 & 115 & 100 & 89 & 114 & 85 & 96\\ \hline \end{array}$$ (i) Use a calculator to calculate $$\displaystyle\overline{{x}}_{{1}},{s}_{{1}},\overline{{x}}_{{2}},{\quad\text{and}\quad}{s}_{{2}}.$$ (Round your answers to two decimal places.) (ii) Assume that the hay fever rate in each age group has an approximately normal distribution. Do the data indicate that the age group over 50 has a lower rate of hay fever? Use $$\displaystyle\alpha={0.05}.$$ (a) What is the level of significance? State the null and alternate hypotheses. $$\displaystyle{H}_{{0}}:\mu_{{1}}=\mu_{{2}},{H}_{{1}}:\mu_{{1}}<\mu_{{2}}$$ $$\displaystyle{H}_{{0}}:\mu_{{1}}=\mu_{{2}},{H}_{{1}}:\mu_{{1}}>\mu_{{2}}$$ $$\displaystyle{H}_{{0}}:\mu_{{1}}=\mu_{{2}},{H}_{{1}}:\mu_{{1}}\ne\mu_{{2}}$$ $$\displaystyle{H}_{{0}}:\mu_{{1}}>\mu_{{2}},{H}_{{1}}:\mu_{{1}}=\mu_{{12}}$$ (b) What sampling distribution will you use? What assumptions are you making? The standard normal. We assume that both population distributions are approximately normal with known standard deviations. The Student's t. We assume that both population distributions are approximately normal with unknown standard deviations, The standard normal. We assume that both population distributions are approximately normal with unknown standard deviations, The Student's t. We assume that both population distributions are approximately normal with known standard deviations, What is the value of the sample test statistic? (Test the difference $$\displaystyle\mu_{{1}}-\mu_{{2}}$$. Round your answer to three decimalplaces.) What is the value of the sample test statistic? (Test the difference $$\displaystyle\mu_{{1}}-\mu_{{2}}$$. Round your answer to three decimal places.) (c) Find (or estimate) the P-value. P-value $$\displaystyle>{0.250}$$ $$\displaystyle{0.125}<{P}-\text{value}<{0},{250}$$ $$\displaystyle{0},{050}<{P}-\text{value}<{0},{125}$$ $$\displaystyle{0},{025}<{P}-\text{value}<{0},{050}$$ $$\displaystyle{0},{005}<{P}-\text{value}<{0},{025}$$ P-value $$\displaystyle<{0.005}$$ Sketch the sampling distribution and show the area corresponding to the P-value. P.vaiue Pevgiue P-value f P-value

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