Question

In: Statistics and Probability

Based on an online survey done recently, the company asked a variety of questions regarding internet...

Based on an online survey done recently, the company asked a variety of questions regarding internet and email practices of a randomly selected sample size of 750 people aged 18 to 25 and 250 people that are over 65 years of age. In response to the question about whether the person has ever clicked on a link in an unsolicited email to get more information, 32% of the young people and 25% of the older folks said yes. Are these two groups equally likely to clinic on a link in an unsolicited email? In other words, does one group practice ‘safe clicking’ more than the other? Use a 95% confidence level. Report a p-value. Is this a weak or strong conclusion?

Solutions

Expert Solution

Sol:

Ho:p1=p2

Ha:p1 p2

alpha=0.05

z=p1^-p2^/sqrt(pbar(1-pbar)*(1/n1+1/n2)

x1=p1*n1=0.32*750=240

x2=p2*n2=0.25*250= 62.5

pbar=x1+x2/n1+n2

=240+62.5/750+250

=302.5/1000

=0.3025

z=(0.32-0.25)/sqrt(0.3025*(1-0.3025)*(1/750+1/250))

z= 2.086719

p value in excel

2*left tail

left tail prob==NORM.S.DIST( -2.086719,TRUE)=0.018456771

=2*0.018456771=
0.036913543

p value=0.036913543

p<0.05

Reject Ho

Accept Ha

Conclusion:

There is no suffcient statistical evidence at 5% level of significance to conlcude that e two groups equally likely to clinic on a link in an unsolicited email.

In other words, does one group practice ‘safe clicking’ more than the other


Related Solutions

Based on an online survey done recently, the company asked a variety of questions regarding internet...
Based on an online survey done recently, the company asked a variety of questions regarding internet and email practices of a randomly selected sample size of 750 people aged 18 to 25 and 250 people that are over 65 years of age. In response to the question about whether the person has ever clicked on a link in an unsolicited email to get more information, 32% of the young people and 25% of the older folks said yes. Are these...
A vehicle quality survey asked new owners a variety of questions about their recently purchased automobile....
A vehicle quality survey asked new owners a variety of questions about their recently purchased automobile. One question asked for the owner’s rating of the vehicle using categorical responses of average, outstanding, and exceptional. Another question asked for the owner’s education level with the categorical responses some high school, high school graduate, some college, and college graduate. Assume the sample data below are for 500 owners who had recently purchased an automobile. Education Quality Rating Some HS HS Grad Some...
A vehicle quality survey asked new owners a variety of questions about their recently purchased automobile....
A vehicle quality survey asked new owners a variety of questions about their recently purchased automobile. One question asked for the owner’s rating of the vehicle using categorical responses of average, outstanding, and exceptional. Another question asked for the owner’s education level with the categorical responses some high school, high school graduate, some college, and college graduate. Assume the sample data below are for  owners who had recently purchased an automobile. Education Quality Rating Some HS HS Grad Some College College...
A vehicle quality survey asked new owners a variety of questions about their recently purchased automobile....
A vehicle quality survey asked new owners a variety of questions about their recently purchased automobile. One question asked for the owner’s rating of the vehicle using categorical responses of average, outstanding, and exceptional. Another question asked for the owner’s education level with the categorical responses some high school, high school graduate, some college, and college graduate. The Excel Online file below contains the sample data for 500 owners who had recently purchased an automobile. Construct a spreadsheet to answer...
A vehicle quality survey asked new owners a variety of questions about their recently purchased automobile....
A vehicle quality survey asked new owners a variety of questions about their recently purchased automobile. One question asked for the owner’s rating of the vehicle using categorical responses of average, outstanding, and exceptional. Another question asked for the owner’s education level with the categorical responses some high school, high school graduate, some college, and college graduate. Assume the sample data below are for  owners who had recently purchased an automobile. Education Quality Rating Some HS HS Grad Some College College...
A vehicle quality survey asked new owners a variety of questions about their recently purchased automobile....
A vehicle quality survey asked new owners a variety of questions about their recently purchased automobile. One question asked for the owner’s rating of the vehicle using categorical responses of average, outstanding, and exceptional. Another question asked for the owner’s education level with the categorical responses some high school, high school graduate, some college, and college graduate. Assume the sample data below are for 500 owners who had recently purchased an automobile. Education Quality Rating Some HS HS Grad Some...
A vehicle quality survey asked new owners a variety of questions about their recently purchased automobile....
A vehicle quality survey asked new owners a variety of questions about their recently purchased automobile. One question asked for the owner’s rating of the vehicle using categorical responses of average, outstanding, and exceptional. Another question asked for the owner’s education level with the categorical responses some high school, high school graduate, some college, and college graduate. Assume the sample data below are for  owners who had recently purchased an automobile. Education Quality Rating Some HS HS Grad Some College College...
One of the questions on a survey asked adults if they used the internet at least...
One of the questions on a survey asked adults if they used the internet at least occasionally. The results showed that 457 out of 478 adults aged 18–29 answered Yes; 743 out of 833 adults aged 30–49 answered Yes; 1,061 out of 1,644 adults aged 50 and over answered Yes. (Round your answers to four decimal places.) (a) Develop a point estimate of the proportion of adults aged 18–29 who use the internet. (b) Develop a point estimate of the...
Chi Square Test of Independence A vehicle quality survey asked new owners a variety of questions...
Chi Square Test of Independence A vehicle quality survey asked new owners a variety of questions about their recently purchased cars. One questions asked for the owner’s rating of the vehicle using categorical responses of average, outstanding, and exceptional. Another question asked for the owner’s education level with the categorical responses some high school, high school graduate, college graduate, and university graduate. Assume the sample data below are for 500 owners who had recently purchased a car. Education Quality Rating...
A survey of undergraduate college students at a small university was recently done by an administrator...
A survey of undergraduate college students at a small university was recently done by an administrator in charge of residential life services. A random sample of 300 students was selected from each class level (freshman, sophomore, junior, senior). Each student was asked to complete and return a short questionnaire on quality of campus residence. Some students returned the questionnaire, and some didn't. This is summarized in the table below: Class Returned Not response Total Freshman 110 190 300 Sophomore 130...
ADVERTISEMENT
ADVERTISEMENT
ADVERTISEMENT