Stats chapters 1-2

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Heights of adult males are known to have a normal distribution. A researcher claims to have randomly selected adult males and measured their heights with the resulting relative frequency distribution as shown here. Identify two major flaws with these results

-All of the relative frequencies appear to be roughly the same. If they are from a normal​ distribution, they should start​ low, reach a​ maximum, and then decrease. -The sum of the relative frequencies is 127​%, but it should be​ 100%, with a small possible​ round-off error.

in a test of a method of gender selection 663 couples used the xsort method and 424 of them bad baby girls

A discrete data set because there are a finite number of possible values

Which of the following is associated with a parameter?

Data that were obtained from an entire population.

Which of the following consists of discrete data? -Amount of rainfall -Tree height -Hair color -Number of suitcases on plane

Number of suitcases on plane

determine whether the given value is a statistic or a parameter. a sample of seniors is selected and it i found that 40% own a computer

Statistic because the value is a numerical measurement describing a characteristic of a sample.

In a set of​ data, blood lead levels are represented as 10 for low, 20 for medium, and 30 for high. The average​ (mean) of the 529 blood lead levels is 25.4. Identify the level of measurement of the​ data. Explain what is wrong with the given calculation.

The data are at the ordinal level of measurement. Such data should not be used for calculations such as an average.

determine whether the data described below are qualitative or quantitative and explain why. the types of food served by restaurants

The data are qualitative because they don't measure or count anything.

Ratings of hotels on a scale from 1 star to 7 stars

The ordinal level of measurement is most appropriate because categories are ordered, but differences cannot be found or are meaningless.

The population of ages at inauguration of all U.S. Presidents who had professions in the military is​ 62, 46,​ 68, 64, 57. Why does it not make sense to construct a histogram for this data​ set?

With a data set that is so​ small, the true nature of the distribution cannot be seen with a histogram.

Heights of adult males are normally distributed. If a large sample of heights of adult males is randomly selected and the heights are illustrated in a histogram, what is the shape of that histogram?

bell shaped

discrete or continuous? the numbers of murders in different cities in a certian year

discrete becuase the data can only take on on specific values

when a car is randomly selected it is found to have 3 wipers

discrete data set becuase there are a finite number of possible values

A​ _______ is a graph of each data value plotted as a point.

dotplot

what would be classified as categorical​ data?

hair color

determine which of the four levels of measurement (nomical, ordinal interval, ratio) is most appropriate for the data below ; states in a region

nominal

the ordinal level of measurement is the most appropriate because categories are ordered, but difference cannot be found or are meaningless hair colors

nominal

which level of measurement consists of categories only where data cannot be arranged in an ordering scheme

nominal

Fill in the blank. ​A(n) _______ distribution has a​ "bell" shape.

normal

Determine which of the four levels of measurement​ (nominal, ordinal,​ interval, ratio) is most appropriate. Voltage measurements of batteries: 1.5V, 3V, 4.5V, 6V, and 7.5V

ratio

Determine which of the four levels of measurement​ (nominal, ordinal,​ interval, ratio) is most appropriate. number of houses people own

ratio level of measurement is most appropriate becuase the data can be ordered

A​ _______ histogram has the same shape and horizontal scale as a​ histogram, but the vertical scale is marked with relative frequencies instead of actual frequencies.

relative frequency

A histogram aids in analyzing the _ of the data.

shape of the distribution

state whether the data described below are discrete or​ continuous and explain why. the circumference of peoples head

the data are continuous because the data can be taken on any value in an interval

determine whether the given value is statistic or parameter. a homeowner measured the voltage supplied to his come on 325 days ofa given year and the average (mean) value is 128.8 volts

the given value is a statistic for the year because the data collected represents a sample

determine which of the four levels of measurement​ (nominal, ordinal,​ interval, ratio) is most appropriate for the data below: internet speed levels of "fast," "medium," and "slow"

the ordinal level of measurement is the most appropriate because categories are ordered, but difference (obtained from subtraction) cannot be found or are meaningless

determine which of the four levels of measurement (nomical, ordinal interval, ratio) is most appropriate for the data below ; college rankings

the ordinal level of measurment is most appropriate because the data can be ordered but the differences cannot be found

A particular country has 50 total states. If the areas of all 50 states are added and the sum is divided by 50​, the result is 192 comma 080 square kilometers. Determine whether this result is a statistic or a parameter.

the result is a parameter because it describes some characteristic of a population

determine whether the given value is statistic or parameter. a study was conducted of all 622 car owners in a certain country

the value is parameter becuase it is a numerical measurement describing some characteristic of a population

The bars in a histogram ___.

touch

If we have a large voluntary response sample consisting of weights of subjects who chose to respond to a survey posted on the​ Internet, can a graph help to overcome the deficiency of having a voluntary response​ sample?

​No, a graph cannot help to overcome the deficiency. If the sample is a bad​ sample, there are no graphs or other techniques that can be used to salvage the data.


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