Stats Exam 5 Essay

So, we should reject the null hypothesis H0. At a 0.05 level of significance level, we conclude that there is a significant difference between the average height for females and the average height for the males.

2) Compute the standard deviation for each of the four samples. Does the assumption of .21 for the population standard deviation appear reasonable?

(1) A study of the number of cars sold looked at the number of cars sold at 500

12. _____ For a given population, confidence intervals constructed from larger samples tend to be narrower than those constructed from smaller samples. Which statement below best describes why this is true? (A) The variability of the sample mean is less for larger samples. (B) The z-value for larger samples tends to be more accurate. (C) The population variance is larger for large populations. (D) As the sample size increases, the z-value (or t-value) becomes smaller. A machine dispenses potato chips into bags that are advertised as containing one pound of product. To be on the safe side, the machine is supposed to be calibrated to dispense 16.07 ounces per bag, and from long time observation, the distribution of the fill-weights is known to be approximately normal and the process is known to have a standard deviation of 0.15 ounces.

According to the website http://womenissues.about.com/cs/abortionstats/a/aaabortionstats.htm there are approximately 126,000 abortions conducted each day throughout the world. This website includes the abortion statistics of the world and breaks the data down to the demographics of the United States. It also discusses the decisions to have an abortion and the use of contraceptives in the United States. This was an informative website and included detailed statistics conducted by the Alan Guttmacher Institute. According to the website http://www.bls.gov/cps in 2000, gon average there were roughly 135 million employed and 6 million unemployed people in the labor force in the United States.h (p. 3) The websites definition of

t = −3.15 describes the difference between women and men for what variable in this study? Is this value significant? Provide a rationale for your answer.

Assume 20% of all email is spam. A large Internet provider plans on conducting a survey of 900 emails to see what percentage are spam.

To state the purpose of the following hematologic tests: total white blood cell count, differential white blood cell count, total red blood cell count,

The information in the table below refers to the 2008 model year product line of BMW automobiles. Identify the Individuals, variables, and data corresponding to the variables in the table below. Determine whether each variable is qualitative, continuous, or, discrete. Please refer to problems #51 and #53 on page 13 for examples.

Read the directions and write answers independently. 1. (L.2) Choose the sentence with correct capitalization and punctuation. A. Mrs. Brown catches the bus at the corner of Elm and N. Grove.

The next table shows the results of this independent t-test. At the .05 significance level, can we conclude

An 18-year-old male college student comes to the student care center complaining of severe fatigue for the past 1–2 weeks and a sore throat for several days. On exam he has significant lymphadenopathy and a temperature of 38.1ºC (100.5º F). The patient’s serum agglutinates horse red blood cells. His peripheral blood smear is likely to show which of the following?

• A bone marrow sample helps find signs of cancer that could be affecting blood production.

Why does the sampling distribution of the mean follow a normal distribution for a large enough sample size, even though the population may not be normally distributed?

Not too long ago, a national, television journalist announced that they were diagnosed with something called MDS. It was the host of “Good Morning America”, Robin Roberts, who reported that she had recently been diagnosed with MDS or myelodysplastic syndrome. She also stated that she had acquired MDS as a result of her initial battle with breast cancer. Robin Roberts is not only a national TV personality, but she is also a local celebrity here on the Gulf Coast. I was captivated by this obviously emotional announcement and the heartfelt outpouring given by Robin on her television show in front of millions of people. Thus, my interest prompted further investigation of how myelodysplastic syndrome affects the bone marrow and blood cells. Journal research from scientific, scholarly sources was necessary to know and understand exactly what type of challenges Robin Roberts is about to face in the weeks ahead.