Kin200 Exam4

Two points on the regression line are ___________. (Round your answers to 2 decimal points and choose carefully!)

(3600, 126.49) and (6000, 165.95)

Two points on the regression line are ___________. (Round your answers to 1 decimal place and choose carefully!)

(6, 3.12) (10, 7.06)

The Y-intercept of the regression line is ___________.

-2.8

The value for the statistic is ___________.

.95

BP will increase how many units for every unit change in Sodium?

0.016

The slope of the regression line is ___________.

0.016

The proportion of variability in pull-ups that we can explain with shoe size is ___________.

0.89

The value for the statistic (r) is ___________.

0.94

The slope of the regression line is ___________.

0.99

The value for the χ2 statistic is ___________.

241.6

The value for the χ2 statistic is ___________.

41.65

The Y-intercept of the regression line is ___________.

67.3

The value for the χ2 statistic is ___________.

8.45

The percentage of variability in blood pressure that we can explain with sodium intake is ________.

89.6%

If Bob has 17 calculators and you take away 8, how may calculators does Bob have left?

9 calculators

For a project in her physiology class, a student investigated the linear relationship between daily sodium intake and blood pressure. She believed that a high sodium diet would relate to high blood pressure. She found 12 volunteer subjects and measured their sodium intake per day and their blood pressure. Their daily sodium intake (mg) and systolic blood pressures are listed in the table below. (Use α = .05) Sodium BP 4000 4500 3500 5000 5200 5100 6000 5400 5300 6000 5500 6200 132 137 130 148 154 158 165 152 150 167 152 177 The research hypothesis would be _________________________.

A positive relationship exists between sodium intake and blood pressure.

The alternate hypothesis would be _______________________.

A relationship exists between sex and preferred driving activity.

Sex is a discrete variable measured at the ordinal level of measurement.

False

Using the students in a university class as the sample for a research study is an example of drawing a systematic sample

False

We will conclude from this problem that a relationship exists between KIN 200 students and blood type.

False

A researcher at UNLV wished to determine if a relationship exists between sex and their preferred activity while driving. Six hundred (600) people were sampled (300 males and 300 females). The subjects in the sample were asked to report the activity they were most likely to participate in while driving. Their choices were (1) talking on their cell phone; (2) drinking (non-alcoholic beverages); and (3) nothing (enjoying the ride). The raw data is in the table below. Your job, as the statistician, is to determine if the variables SEX and PREFERRED DRIVING ACTIVITY are independent and draw conclusions from your analysis. Preferred driving activity Cell Phone Drinking Enjoying the ride Sex Male 60 65 175 Female 200 95 5 The null hypothesis would be __________________________.

No relationship exists between sex and preferred driving activity.

The variable blood type is measured at the _________________ level of measurement.

Nominal

The variable type of animal is measured at the _________________ level of measurement.

Nominal

Ima Longhorn, a graduate student at an unnamed institution of higher learning, decided to break into the world of research by proving that she could predict a person's capability for doing pull‑ups simply by knowing their shoe size. She hypothesized that big feet were heavier than small feet and would therefore be harder to lift. Ima randomly sampled 10 of her fellow students and recorded their shoe sizes and their max scores for a pull‑up test. Her data is recorded below. (Use α = .05) Subject Shoe size Pull-ups 1 8 6 2 10 7 3 5 2 4 7 4 5 6 3 6 7 5 7 11 8 8 10 6 9 7 5 10 5 1 The null hypothesis would be __________________________.

P=0

The null hypothesis would be __________________________.

P=0

The alternate hypothesis would be _______________________.

P>0

We will conclude from this problem _______________________________.

People with high sodium diets tend to have higher systolic blood pressure.

What type of variable is sodium (ml)?

Quantitative and continuous

What level of measurement is sodium (ml)?

Ratio

We will conclude from this problem that _____________________________.

Significantly fewer males and significantly more females than expected talk on the phone while driving.

We will also conclude from this problem that ____________________________.

Significantly fewer people than expected in Las Vegas prefer cats than dogs.

We will also conclude from this problem that _____________________________.

Significantly more males than expected enjoy the ride while driving.

We will conclude from this problem that ______________________________.

Significantly more people than expected in Las Vegas prefer dogs than cats

What should Ima's research hypothesis have said?

Students with larger feet can do more pull-ups

The alternate hypothesis would be _______________________.

The distribution is not: 50% Dogs, 50% Cats

The ASPCA would like your help in discovering if Las Vegas residents prefer dogs or cats. Two thousand (2000) residents were surveyed and the results are in the following table: Prefer dogs Prefer cats 1065 935 The null hypothesis would be __________________________.

The distribution is: 50% Dogs, 50% Cats

The alternate hypothesis would be _______________________.

The population distribution is not: 47% O, 9% A, 40% B, 4% AB

According to the Community Blood Center, the distribution of blood types (not considering Rh factor) is as follows: Type O Type A Type B Type AB 47% 9% 40% 4% The following data comes from a survey given in two KIN 200 courses. Determine if the data from the 74 undergraduate college students matches the distribution of blood types reported by the Community Blood Center. Type O Type A Type B Type AB 38 17 10 9 The null hypothesis would be __________________________.

The population distribution is: 47% O, 9% A, 40% B, 4% AB

We will also conclude from this problem that _______________________________.

There were significantly fewer students than expected with Type B blood

We will conclude from this problem that ______________________________.

There were significantly more students than expected with Type AB blood.

The results of the study were in agreement with Ima's research hypothesis.

True

There is a 5% chance that a Type 1 error could have been made in this problem.

True

We will reject the null hypothesis for this problem.

True

The type of statistical error we could have made in this problem is a ___________.

Type 1

The variable that we measure in a research study.

dependent

Shoe size is a ___________ variable measured at the _______________ level of measurement.

discrete, interval

Pull-ups is a ___________ variable measured at the _______________ level of measurement.

discrete, ratio

A carefully designed study that seeks to determine, under controlled conditions, the effectiveness of a treatment method.

experiment (clinical trial)

A category of statistics that deals with reaching conclusions from incomplete information. Information is obtained from a sample and generalized to a population.

inferential

The variable Preferred driving activity is measured at the _________________ level of measurement.

nominal

The variable Sex is measured at the _________________ level of measurement.

nominal

The p-value is ___________.

p < 0.001

The p-value is ___________.

p = 0.004

The variable Preferred driving activity is a _________________ variable.

qualitative

The variable Sex is a _________________ variable.

qualitative

The variable blood type is a _________________ variable.

qualitative

The variable type of animal is a _________________ variable.

qualitative

A sample that reflects the characteristics of interest from the target population.

representative

Which of the following is not a measure of central tendency?

standard deviation

The formula for the regression line is ___________.

Ŷ = -2.8 + 0.99X

The formula for the regression line is ___________.

Ŷ = 67.3 + 0.016X

The alternate hypothesis, based on Ima's research hypothesis, would be _______________________.

ρ < 0