Ask Question, Ask an Expert


Ask Statistics and Probability Expert

problem1. The data set lowbwt.sav having information for a sample of 100 low birth weight infants born in two teaching hospitals in Boston. Measurements of the systolic blood pressure are saved under the variable name sbp and indications of gender—with 1 representing a male and 0 a female—under the name sex.

(a) Find a histogram of systolic blood pressure. Based on graph, do you think that blood pressure is approximately normally distributed?

(b) Employ the Shapiro-Wilks test to check for the normality of blood pressure. Carefully describe your conclusion.

(c) Find the mean and standard deviation of blood pressure by sex. prepare a short abstract of these summary statistics.

(d) Test the null hypothesis that among low birth weight infants, the mean systolic blood pressure for boys is equal to the mean for girls.

Use a two-sided test at the 5% level of significance. What do you conclude?

problem2. A number of years ago the American Academy of Pediatrics suggested that tetracycline drugs not be used for children under the age of 8. Prior to this recommendation, a two-year study conducted in Tennessee had investigated the extent to which physicians prescribed this drug in the prior two years. In the study a random sample of 770 family practice physicians were characterized according to whether the county of their practice was urban, suburban, or rural. The numbers of doctors in each of these categories who did and didn’t prescribe tetracycline to at least one child under the age of 8 are given below.

                     Urban       County Suburban    Rural
Tetracycline      65              90                      172
No Tetracycline 149            136                    158

Please use SPSS only for part (i) below.

(a) Identify the illustrative and the response variables in this case.

(b) For each county type, find out the percentage of physicians who prescribed tetracycline.

(c) Based on your percentages in part (b), elucidate the relationship, if any, between the two variables.

(d) find out the expected counts for the six cells under assumption that these two variables are independent.

(e) find out the value for the test statistic associated with the Chi-square test for independence.

(f) Use the Vassar applet to evaluate the p-value associated with this test.

(g) Find the odds of prescribing tetracycline for physicians in each of three county types.

(h) Find two odds ratio using urban counties as the reference. Put the odds for urban counties as the denominator in each case. Interpret your two values.

(i) You will find the raw data for this problem in the data set tetracycline.sav. Use SPSS to get your values in parts (b), (d), (e), and (f). Paste your output here.

Statistics and Probability, Statistics

  • Category:- Statistics and Probability
  • Reference No.:- M91145

Have any Question? 

Related Questions in Statistics and Probability

1 how many conditions are there in the simplest possible

1. How many conditions are there in the simplest possible experiment? 2. Describe how participants are assigned to conditions in randomized groups, matched-subjects, and repeated measures experimental designs. 3. What ar ...

Are memoirs a primary or a secondary source could they be

Are memoirs a primary or a secondary source? could they be considered both a primary and secondary source?

1 how does the sample size influence the extent to which

1. How does the sample size influence the extent to which the sample data can be used to accurately estimate population parameters? 2. What statistics are used to indicate how accurately the sample data can predict popul ...

A history class is comprised of 6 female and 7 male

A history class is comprised of 6 female and 7 male students. If the instructor of the class randomly chooses 11 students from the class for an oral exam, what is the probability that 5 female students and 6 male student ...

1 what is a restricted range and what effect does it have

1. What is a restricted range, and what effect does it have on correlation coefficients? How would you detect and correct a restricted range? 2. How do we know whether a particular score is an outlier?

When how and why was israel created discuss the six day

When, how, and why was Israel created? Discuss the Six Day War and the Yom Kipper War from both the Israeli and Arab points of view. Who are the most important leaders and personalities in the Middle East today?How might ...

Risk taking is an important part of investing in order to

Risk taking is an important part of investing. In order to make suitable investment decisions on behalf of their customers, portfolio managers give a questionnaire to new customers to measure their desire to take financi ...

Final stats paper the final paper provides you with an

Final Stats Paper The final paper provides you with an opportunity to integrate and reflect on what you have learned in this course. The question to address is: "What have you learned about statistics?" In developing you ...

1 why do researchers use inferential statistics2

1. Why do researchers use inferential statistics? 2. Distinguish between the null hypothesis and the experimental hypothesis. 3. When analyzing data, why do researchers test the null hypothesis rather than the experiment ...

1 a producer specifies that the mean lifetime of a certain

1. A producer specifies that the mean lifetime of a certain type of battery is at least 240 hours. A sample of 18 such batteries yielded the following data. 237             242             232 242             248         ...

  • 4,153,160 Questions Asked
  • 13,132 Experts
  • 2,558,936 Questions Answered

Ask Experts for help!!

Looking for Assignment Help?

Start excelling in your Courses, Get help with Assignment

Write us your full requirement for evaluation and you will receive response within 20 minutes turnaround time.

Ask Now Help with Problems, Get a Best Answer

WalMart Identification of theory and critical discussion

Drawing on the prescribed text and/or relevant academic literature, produce a paper which discusses the nature of group

Section onea in an atwood machine suppose two objects of

SECTION ONE (a) In an Atwood Machine, suppose two objects of unequal mass are hung vertically over a frictionless

Part 1you work in hr for a company that operates a factory

Part 1: You work in HR for a company that operates a factory manufacturing fiberglass. There are several hundred empl

Details on advanced accounting paperthis paper is intended

DETAILS ON ADVANCED ACCOUNTING PAPER This paper is intended for students to apply the theoretical knowledge around ac

Create a provider database and related reports and queries

Create a provider database and related reports and queries to capture contact information for potential PC component pro