Use the following information for all remaining questions on this worksheet.

The lengths of human pregnancies are normally distributed with a mean of 268 days and a standard deviation of 15 days.

a. If one pregnant woman is randomly selected, find the probability that her pregnancy lasts less than 260 days. Round your result to 4 decimal places.

b. Is it unusual for one woman to have a pregnancy that lasts less than 260 days?

c. If we looked at a random sample of 100 pregnant women would expect_____to have pregnancies lasting less than 100 days.

d. A researcher chooses a sample of 25 pregnant women and wants to look at the mean length of the pregnancies for the sample. Does the Central Limit Theorem Apply? Briefly explain why or why not.

e. For groups of 25 women, find the mean and standard error for the sampling distribution of the mean length of pregnancy. Round the value to one decimal place, if rounding is necessary. Be sure to include units.

mean: (select)

standard error: (select)

f. What is the probability that a randomly selected sample of 25 pregnant women have a mean length of pregnancy less than 260 days? Round your response to 4 decimal places.

g. Based on your response to the previous question, is it unusual for a random sample of 25 women to have a mean length of pregnancy of less than 260 days? Explain your response in a full sentence.

h. If a random sample of 25 pregnant women had a mean length of pregnancy of less than 260 days, does that mean that all 25 women had a pregnancy that lasted less than 260 days? Explain your response in a full sentence.

i. For random samples of 25 pregnant women, 95% of all sample means for the mean length of pregnancy will fall between __ days and ___days?

In an online Human Computer Interaction (HCI) lecture, the lecturer mentioned that there are many rules that have been created to guide computer software programmers as well as hardware designers. He mentioned “ben Shneiderman’s eight golden rules” as one of such guidelines, and went on to explain each rule to the class using real life examples. As a teaching assistant in the IT department in Wisconsin international university college Ghana the HCI lecturer have asked you to teach his next class the following guidelines:

i. Interface Design Guidelines,

ii. guidelines for Information Display In not less than 100 words and in your own words describe, using any application software of your choice, each of the rules in the guidelines listed above stating how they were applied.

Data from the national vital statistics system reveal that the distibution of the duration of human pregnancies is approximately normal with a mean of 270 days and a standard deviation of 17 days

Which of the following statements are true

A. The area under the curve to the left of z= -1.53 is .0630

b. A z-score = 0.25 can be interpreted as a 25% probability that a pregnancy will last 274 days or longer

c. Approximately 14.46% of all pregnancies have a duration less than 252 days

d. the z-score for a pregnancy that has a duration of 275 days(9 months) is 0.29

e. The area under the curve to the left of a z-score = -0.10 is approximately 10%

f. Approximately 98% of all pregnancies have a duration longer than 236 days

g. The z-score for a pregnancy that has a duration of 300 days is 1.76

h. The area under the curve to the right of a z-score = 0.70 is 0.7580

Someone calculates that the mineral content and physiological properties of the human body have a net worth of about $2.65. Many estimates, however, have been calculated to appraise the real value of human life with one unanimous decision. Every human being is priceless. No monetary value can adequately replace us. No amount of money can compensate for the capabilities of the mind, body, and spirit. This fact alone would make you think that each individual has a lot going in her/or his direction. We tend to dwell on our negative characteristics and this focus can really impede our quality of life. Perhaps the roots of American negativism can be traced to the dogma of Puritanism, where personal worth was believed to be equal to the work you did, and no amount of work was ever enough. It is a fact, however, that Americans typically tend to take a very negative attitude towards themselves. Compound this with the concept of self-filling prophecy and you have a no win situation regarding self-esteem and successful strategies for stress management.

We all have many positive attributes, those qualities that we take pride in form our physical, mental, emotional and spiritual make up. We need to be reminded of these qualities to boost our self- esteem when the gray could of life start to collect over our heads.

Take a moment to reflect on your positive attributes; those qualities that make you unique. Select from all areas of your total well being including your physical, intellectual, emotional and spiritual dimensions. Write them in a list, and describe each one and reasons why you consider it to be an asset. If you can’t come up with 8 – 10 attributes, ask a few friends to suggest what they see as your positive attributes.   You may be surprised to find what they see in you that you may fail to recognize in yourself. On days when you need a boost in your self-esteem, review this list.

The Human Resource Manager of a large insurance company wishes to evaluate the leadership qualities of 3 manager groups- supervisors, mid-level managers and upper-level managers.

12 people from each management level were sampled.

Is there a difference on the average of the leadership scores for the three groups? Part of the leadership scores (higher is better) and ANOVA table are as follows:

ANOVA TABLE  

. Assume that the calculated value of the test statistic is 3. What is the conclusion for the ANOVA test? Use the critical F-value from Question 11.

(Question 11:

The critical value of the ANOVA test at 1% alpha is:

5.31)

In this discussion, give examine aspects of the human nervous system, how they function, and how disorders affect them.

There are many disorders associated with the nervous system. Identify two disorders, compare each one's effects on the nervous system, and describe their progression. What are their signs and symptoms? Which disorder seems more severe? Why?

Use textbook or Internet search to find possible treatments for each disorder that you identified. Which disorder seems more treatable?

Which of the following statements would be true of a human trait that has high heritability in a population of one country? why?

a. The phenotypic difference within monozygotic twin pairs would be about the same as the phenotypic differences among members of dizygotic twin pairs. why?

b. There is very little phenotypic variation between monozygotic twins but high variability between dizygotic twins. why?

c. The trait would have the same heritability in a population of another country. why?

Use the following information for all remaining questions on this worksheet.

The lengths of human pregnancies are normally distributed with a mean of 268 days and a standard deviation of 15 days.


1.a) If one pregnant woman is randomly selected, find the probability that her pregnancy lasts less than 260 days. Round your result to 4 decimal places.

a. 0.2969

b. 0.7031

c. 0.5000

d. 0.2742


1.b) Is it unusual for one woman to have a pregnancy that lasts less than 260 days?

a. No, the probability is greater than 0.05.

b. Yes, the probability is greater than 0.05.

c. Yes, the probability is less than 0.05.

d. No, the probability is less than 0.05.


1.c) Complete the following sentence: If we looked at a random sample of 100 pregnant women would expect ____  to have pregnancies lasting less than 100 days.

a. 29 or 30

b. 27 or 28

c. about 50

d. 71 or 72


1. d) A researcher chooses a sample of 25 pregnant women and wants to look at the mean length of the pregnancies for the sample. Does the Central Limit Theorem Apply? Briefly explain why or why not.


1.e) What is the probability that a randomly selected sample of 25 pregnant women have a mean length of pregnancy less than 260 days? Round your response to 4 decimal places.


1.f) Based on your response to the previous question, is it unusual for a random sample of 25 women to have a mean length of pregnancy of less than 260 days? Explain your response in a full sentence.


1.g) If a random sample of 25 pregnant women had a mean length of pregnancy of less than 260 days, does that mean that all 25 women had a pregnancy that lasted less than 260 days? Explain your response in a full sentence.

Use the following information for all remaining questions on this worksheet.

The lengths of human pregnancies are normally distributed with a mean of 268 days and a standard deviation of 15 days.


1.a) If one pregnant woman is randomly selected, find the probability that her pregnancy lasts less than 260 days. Round your result to 4 decimal places.

a. 0.2969

b. 0.7031

c. 0.5000

d. 0.2742


1.b) Is it unusual for one woman to have a pregnancy that lasts less than 260 days?

a. No, the probability is greater than 0.05.

b. Yes, the probability is greater than 0.05.

c. Yes, the probability is less than 0.05.

d. No, the probability is less than 0.05.


1.c) Complete the following sentence: If we looked at a random sample of 100 pregnant women would expect ____  to have pregnancies lasting less than 100 days.

a. 29 or 30

b. 27 or 28

c. about 50

d. 71 or 72


1. d) A researcher chooses a sample of 25 pregnant women and wants to look at the mean length of the pregnancies for the sample. Does the Central Limit Theorem Apply? Briefly explain why or why not.


1.e) What is the probability that a randomly selected sample of 25 pregnant women have a mean length of pregnancy less than 260 days? Round your response to 4 decimal places.


1.f) Based on your response to the previous question, is it unusual for a random sample of 25 women to have a mean length of pregnancy of less than 260 days? Explain your response in a full sentence.


1.g) If a random sample of 25 pregnant women had a mean length of pregnancy of less than 260 days, does that mean that all 25 women had a pregnancy that lasted less than 260 days? Explain your response in a full sentence.

Q1. The hormone norepinephrine is released in the human body during stress and increases the body’s metabolic rate. Like many biochemical compounds, norepinephrine is composed of carbon, hydrogen, oxygen, and nitrogen. The percent composition of this hormone is 56.8% C, 6.56% H, 28.4% O, and 8.28% N. What is the empirical formula of norepinephrine?  

Q2. Elemental magnesium consists of three isotopes: ²⁴Mg with an accurate mass of 23.99 amu, ²⁵Mg with an accurate mass of 24.99 amu, and ²⁶Mg with an accurate mass of 25.99 amu. If ²⁴Mg is 79% of naturally occurring magnesium, what is the percent abundance of ²⁶Mg?   

A) 10%

B) 11%

C) 15%

D) 19%

E) 21%

Q3. A compound containing xenon and fluorine was prepared by shining sunlight on a mixture of Xe (0.526 g) and excess F₂ gas. If you isolate 0.678 g of the new compound, what is its empirical formula?