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Escarly Vazquez

Escarly V.

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Mensa Membership in Mensa requires a score in the top $2 \%$ on a standard intelligence test. The Wechsler IQ test is designed for a mean of 100 and a standard deviation of $15,$ and scores are normally distributed. a. Find the minimum Wechsler IQ test score that satisfies the Mensa requirement. b. If 4 randomly selected adults take the Wechsler IQ test, find the probability that their mean score is at least $131 .$ c. If 4 subjects take the Wechsler test and they have a mean of 132 but the individual scores are lost, can we conclude that all 4 of them are eligible for Mensa?

Mensa Membership in Mensa requires a score in the top $2 \%$ on a standard intelligence test. The Wechsler IQ test is designed for a mean of 100 and a standard deviation of $15,$ and scores are normally distributed. a. Find the minimum Wechsler IQ test score that satisfies the Mensa requirement. b. If 4 randomly selected adults take the Wechsler IQ test, find the probability that their mean score is at least $131 .$ c. If 4 subjects take the Wechsler test and they have a mean of 132 but the individual scores are lost, can we conclude that all 4 of them are eligible for Mensa?

Elementary Statistics

Normal Probability Distributions

The Central Limit Theorem

Effectiveness of a Drug A certain disease has a mortality rate of 60$\% .$ A new drug is tested for its effectiveness against this disease. Ten patients are given the drug, and eight of them recover. (a) Find the probability that eight or more of the patients would have recovered without the drug. (b) Does the drug appear to be effective? (Consider the drug effective if the probability in part (a) is 0.05 or less.)

Effectiveness of a Drug A certain disease has a mortality rate of 60$\% .$ A new drug is tested for its effectiveness against this disease. Ten patients are given the drug, and eight of them recover. (a) Find the probability that eight or more of the patients would have recovered without the drug. (b) Does the drug appear to be effective? (Consider the drug effective if the probability in part (a) is 0.05 or less.)

Algebra and Trigonometry

Counting and Probability

Binomial Probability
The histogram in Figure $2-2$ on page 55 is constructed from a simple random sample of children, If you construct a histogram with data collected from a voluntary response sample, will the distribution depicted in the histogram reflect the true distribution of the population? Why or why not?

The histogram in Figure $2-2$ on page 55 is constructed from a simple random sample of children, If you construct a histogram with data collected from a voluntary response sample, will the distribution depicted in the histogram reflect the true distribution of the population? Why or why not?

Elementary Statistics

Summarizing and Graphing Data

Histograms
Data Set 3 "Body Temperatures" in Appendix B includes a sample of 106 body temperatures having a mean of $98.20^{\circ} \mathrm{F}$ and a standard deviation of $0.62^{\circ} \mathrm{F}$ (for day 2 at $12 \mathrm{AM}$ ). Construct a $95 \%$ confidence interval estimate of the standard deviation of the body temperatures for the entire population.

Data Set 3 "Body Temperatures" in Appendix B includes a sample of 106 body temperatures having a mean of $98.20^{\circ} \mathrm{F}$ and a standard deviation of $0.62^{\circ} \mathrm{F}$ (for day 2 at $12 \mathrm{AM}$ ). Construct a $95 \%$ confidence interval estimate of the standard deviation of the body temperatures for the entire population.

Essentials of Statistics

Estimating Parameters And Determining…

Estimating a Population Standard…

Questions asked

INSTANT ANSWER

23. The electron affinity for Lithium is \( 59.6 \mathrm{~kJ} / \mathrm{mol} \). If we had 364 mg of elemental Lithium (Li), how much energy would we need to put into the system to create 364 mg of Li?? 24. The electron affinity for sodium is \( 52.8 \mathrm{~kJ} / \mathrm{mol} \). Why is sodium's electron affinity lower than the electron affinity for lithium?

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INSTANT ANSWER

Part V: I see the light! ( \( 5 \times 4 \) pts \( =20 \) pts) The Lithium emission spectrum has several prominent lines in the visible spectrum: Lithium Emission Spectrum \begin{tabular}{|c|c|} \hline Wavelength \( (\lambda) \) & color \\ \hline 424.3 nm & purple \\ \hline 460.3 nm & blue \\ \hline 497.2 nm & green \\ \hline 610.37 nm & yellow \\ \hline 670.8 nm & red \\ \hline \end{tabular} what is the energy associalod with the highest frequency emission?

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INSTANT ANSWER

The Lithium emission spectrum has several prominent lines in the visible spectrum: Lithium Emission Spectrum \begin{tabular}{|c|c|} \hline Wavelength \( (\lambda) \) & color \\ \hline 424.3 nm & purple \\ \hline 460.3 nm & blue \\ \hline 497.2 nm & green \\ \hline 610.37 nm & yellow \\ \hline 670.8 nm & red \\ \hline \end{tabular} 20. What is the wavelength associated with the highest energy emission? What is the frequency of the wavelength associated with the highest energy emission? 21. What is the wavelength associated with the lowest energy emission? What is the frequency of the wavelength associated with the lowest energy emission?

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ANSWERED

Lijeesh Krishnan verified

Numerade educator

Draw the following chemicals in their Lewis Structure form using sticks as bonds and dots as lone pairs. Be sure to include and label all resonance structures when relevant, include and label all isomers when relevant, and indicate the most likely chemical structure based on formal charge when relevant. CO2H– (only show structures with carbon as the central atom)

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INSTANT ANSWER

Why are chemical properties largely more conserved in groups than in periods throughout the periodic table?

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ANSWERED

Lijeesh Krishnan verified

Numerade educator

For each phenomenon, describe why the trends exist. You must use electronics to defend your answer (3 x 2 pts each = 6 pts) 12. Electron affinity | 13. Atomic radius | 14. Electronegativity |

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ANSWERED

Lijeesh Krishnan verified

Numerade educator

Is the product of the reaction - 2-hydroxypropanenitrile - capable of hydrogen bonding? Why or why not?

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ANSWERED

Jennifer Hudspeth verified

Numerade educator

what is the lewis structure for liquid 2-hydroxypropanenitrile (C3H5NO)?

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INSTANT ANSWER

You’re working on a reaction that involves liquid acetaldehyde (C2H4O) which reacts with liquid hydrogen cyanide (HCN) to form liquid 2-hydroxypropanenitrile (C3H5NO). You combine 5 mL of 20 M acetaldehyde with 3.5 mL of 15 M hydrogen cyanide and you yield 1.5 g of 2-hydroxypropanenitrile. There is a central carbon in both acetaldehyde and 2-hydroxypropanenitrile. What is the hybridization of the central carbon molecular orbital on the reactant side of the equation for acetaldehyde? What is the hybridization of the central carbon molecular orbital on the product side of the equation for 2-hydroxypropanenitrile?

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ANSWERED

Susan Hallstrom verified

Numerade educator

Part II: Understanding reactions (5 parts x 4 pts each = 20 pts) You're working on a reaction that involves liquid acetaldehyde (C2H4O) which reacts with liquid hydrogen cyanide (HCN) to form liquid 2-hydroxypropanenitrile (C3H5NO). You combine 5 mL of 20 M acetaldehyde with 3.5 mL of 15 M hydrogen cyanide and you yield 1.5 g of 2-hydroxypropanenitrile. 6. Write out the balanced equation for the above reaction, including states of matter and stoichiometric coefficients (4 pts). 7. Determine the percent yield for your reaction (4 pts).

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