Question

**Immediately after a ban on using hand-held cell phones while driving was implemented, compliance with the law was measured. A random sample of 1,250 drivers found that 98.9% were in compliance. A year after the implementation, compliance was again measured to see if compliance was the same (or not) as previously measured. A different random sample of 1,100 drivers found 96.9% compliance.**a.State an appropriate null and alternative hypothesis for testing whether or not there is any statistical difference (i.e., a two-sided test) in these two proportions measured initially and then one year later. Conduct the test of hypothesis using a significance level of α= 0.05. Be sure to check the assumptions and conditions for your test. State the P-value of your test and also state your conclusion. (Feel free to use R in showing your work - and show your commands and output if using R.) b. Develop a 95% confidence interval for the true difference in proportions between the first survey and the second survey and explain what this confidence interval means in context of this problem. (Feel free to use R in showing your work - and show your commands and output if using R.

Answer #1

d)

A certain golf club manufacturer advertises that its
new driver (the club you use to hit golf balls off the tee) will
increase the distance that golfers achieve relative to their
current driver. We decide to test this claim by having 15 golfers
hit a drive using the new driver, and then hit one using their
current driver. Here are the data for 15 people, with yardages
using both clubs:
1
2
3
4
5
6
7
8
9
10...

PLEASE DO NOT HANDWRITE
A certain golf club manufacturer advertises that its
new driver (the club you use to hit golf balls off the tee) will
increase the distance that golfers achieve relative to their
current driver. We decide to test this claim by having 15 golfers
hit a drive using the new driver, and then hit one using their
current driver. Here are the data for 15 people, with yardages
using both clubs:
1
2
3
4
5
6...

CAN ANYONE SOLVE THIS BY USING R ? CAN YOU PLEASE NOT USE the
(CORRECT=F FUNCTION) WHEN SOLVING PART B, I AM NOT VERY CLEAR WITH
THAT.
2) From a random sample of 673 items made by a particular
manufacturing process, it is found that 27 are defective.
(a) (1 mark) Find a 99.5% confidence interval for the proportion
of defective items made by the process. (Also include the commands
and output.)
(b) (1 mark) Give the command and output...

1. A Pew Research study regarding cell phones asked questions
about cell phone experience. One growing concern is unsolicited
advertising in the form of text messages. Pew asked 1150 cell phone
owners, “Have you ever received unsolicited text messages on your
cell pone from advertisers?” and 17% reported that they had.
a) State the parameter you want to estimate.
b) Check conditions and identify the appropriate inference
method.
c) If the conditions have been met, perform the calculations for
a...

GMU officials are trying to determine if they are using the
correct number of campus shuttles for the number of individuals who
use them. If the proportion of individuals associated with GMU
(including faculty, staff, and students) who use the shuttles is
significantly different from 0.28, the officials believe they will
have to either remove or add a shuttle to the fleet. In a random
sample of 444 people taken from the population of all individuals
associated with GMU (including...

Psychologists conducted a survey of 258 student drivers and
their attitudes toward speeding and reported the results in the
British Journal of Educational Psychology (Vol. 80, 2010). One of
the variables of interest was the response to the question, "Are
you confident that you can resist your friends' persuasion to drive
faster?" Each response was measured on a 7-point scale, from 1 =
"definitely no" to 7 = "definitely yes." The data were collected 5
months after the students had...

A study is done to see if the brand of someone’s phone is
related to how many minutes of call time they use per month. The
data can be found in the Excel sheet labeled Q2 Data. There were 34
people studied and their phone brand and number of minutes were
recorded.
a. Use ToolPak to run a t-Test and
summarize the information found in the table below. You should also
print the excel output.
Samsung
Apple
Sample Mean
Sample Variance...

From public records, individuals were identified as having been
charged with drunken driving not less than 6 months or more than 12
months from the starting date of the study. Two random samples from
this group were studied. In the first sample of 30 individuals, the
respondents were asked in a face-to-face interview if they had been
charged with drunken driving in the last 12 months. Of these 30
people interviewed face to face, 16 answered the question
accurately. The...

A poll done for an organization found that 13% of Americans have
seen or sensed the presence of an angel. A contingent doubts that
the percent is really that high. It conducts its own survey. Out of
78 Americans surveyed, only two had seen or sensed the presence of
an angel. As a result of the contingent's survey, would you agree
with the organization's poll? Conduct a hypothesis test at the 5%
level.
Note: If you are using a Student's...

Data Set Preparation
(Using A JMP Folder) Can email you if comment your email.
1. (10 pts.) Using the “Toyota Corolla” data set on Canvas (Home
à “JMP” à “(Under: JMP Data Sets folder)”, you will be modeling the
“Price” of a car as the dependent variable (Y). Please select one
independent variable (X) you think may help explain Price, from the
following three: “Age”, “Mileage”, or “Weight” of a car. In the
space below, state your choice and explain...

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