Significant differences between the groups

Assignment Help Basic Statistics
Reference no: EM13543967

Items 1 and 2 relate to the following SPSS output. A researcher is interested in characteristics of HIV+ and HIV- adolescents interviewed 166 young adults about their experiences during adolescence. He wished to know, among other things, if there were significant differences in the ages at which HIV+ and HIV- young adults became sexually active. The following is the printout of this analysis:

_______________________________________________________________________

HIV Status                              N         Mean               sd                    Stnd. Error                 

Age at             Positive           57        13.2                 2.96576           .39282

first sexual

experience       Negative          109      15.1                 2.57286           .24644

________________________________________________________________________

Independent Samples Test

_______________________________________________________________________

                                                                        Levene's Test for

                                                                        Equality of Variances

                                                                        F                      Sig      

Age at             Equal variance assumed          1.313               .254

first sexual

experience       Equal variance not assumed

                                                                                                                                               

                                                                                                                                                

                                                            t-test for Equality of Means

                                                                                                                                               

                                                                        t           df        sig.       mean difference         

Age at             Equal variance assumed          -2.870  164      .005                 -1.9

first sexual

experience       Equal variance not assumed    -2.745  99.66   .007                 -1.9

                                                                                                                                               

1. Were there significant differences between the groups. Give the relevant stastical data to support your answer?

2. What is the confidence interval associated with your answer to item # 1?

Reference no: EM13543967

Previous Q& A

  The density of a gas t the temperature and p its pressure

If M is the molar mass, R the gas constant, T the temperature, and P its pressure, which of the following expressions represents the density of a gas

  Determine what force is applied to the lid

An 18.7 cm screwdriver is used to pry open a can of paint. If the axis of rotation is 3.07 cm from the end of the screwdriver blade, what force is applied to the lid

  Rate must heat be supplied to power plant by burning coal

At a coal-burning power plant a steam turbine is operated with a power output of 465 MW. The thermal efficiency of the power plant is 31.6%. (a) At what rate is heat discarded to the environment by this power plant? (b) At what rate must heat be supp..

  The genomes of multiple homo neanderthalensis

After the genomes of multiple Homo neanderthalensis individuals were sequenced,

  Find the force on each side of the loop

A single-turn square loop of wire, 2.00 cm on each edge, carries a clockwise current of 0.170 A. Find the force on each side of the loop

  Disregard the friction between the skates and the ice

A 67.0-kg person throws a 0.0500-kg snowball forward with a ground speed of 25.0 m/s. A second person, with a mass of 59.0 kg, catches the snowball. Both people are on skates. The first person is initially moving forward with a speed of 2.10 m/s, and..

  Find current is required in the windings for that to occur

A long solenoid that has 940 turns uniformly distributed over a length of 0.390 m produces a magnetic field of magnitude 1.00 10-4 T at its center. What current is required in the windings for that to occur

  What percent of the time would you expect predictions

In using the data from study A to make predictions, what percent of the time would you expect predictions to be exactly correct?

  Dynein powers flagella that propel unicellular organism

The protein dynein powers the flagella that propel some unicellular organism. biophysicists have found that dynein is intrinsically oscillatory and that it exerts peak forces of about 1.0 pN when it attaches to structures called microtubules. thee re..

  Explain calcium nitrate will react with ammonium chloride

Calcium Nitrate will react w/ ammonium chloride at slightly elevated temperatures, as represented in the equation. Ca(NO3)2 (s) + 2NH4Cl(s) ? 2N2O(g) + CaCl2(s) + 4 H2O (g)

Reviews

Write a Review

 

Similar Q& A

  Find mean and standard deviation of proportions

What are the mean and standard deviation of the proportions of random samples of 400 motorcylce owners who own Harleys?

  Estimation-level of confidence

A random check of 81 records of inmates from all federal prisons found the confidence interval for mean prison terms per prisoner to be 2.113 years to 2.287 years.

  Evaluating true mean delivery time using standard deviation

Evaluate true mean delivery time to within 5 minutes at 90% reliability level?   Suppose that standard deviation for delivery times is 18.2 minutes.

  Home design results in lower electricity use than in convent

1. A developer wants to claim that his new "green" home design results in lower electricity use than in conventional homes. His 2,000 square foot model home uses 1,200 kilowatt hours per month on average.

  Compute critical values given number of pairs of data

Linear correlation between two variables. Find the critical values of r given the number of pairs of data n and the significance level alpha. n = 11, Alpha = 0.01

  Explain what alternatives choose to increase profits

Decrease your sales price by $5 in order to increase sales by 5,000 units. Which of the above alternatives would your choose to increase profits?

  Significance level-guideline is still reasonable

At the .05 significance level, can we conclude that the guideline is still reasonable?

  Random variable and probability distribution

The difference between a random variable and a probability distribution is: A. A random variable does not include the probability of an event. B. A random variable can only assume whole numbers

  Mean and standard deviation of the sample mean

For sample of size 100, what is the mean and standard deviation of the sample mean.

  What will be the standard deviation of the number of men

what is the chance the average contents of the cans will be less than advertised and what will be the standard deviation of the number of men who help at home, based on the first survey

  Draw a sketch to show proportion of runners

Mean of 61 minutes and a standard deviation of 9 minutes. Find the proportion of runners who take more than 70 minutes to finish. Draw a sketch to show this proportion.

  Probability that exactly one woman is selected

Satellite Office Systems has vacancies for two executives that it will fill from among four women and six men. What is the probability that exactly one woman is selected?

Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd