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Statistics 8th Edition Jia Junping Chapter 1 after class exercises and answers summary
2022-07-06 14:42:00 【No two or three things】
One 、 Exercises
1 Indicate the types of the following variables .
(1) Age .
(2) Gender .
(3) Automobile output .
(4) Employees' attitude towards a reform measure of the enterprise ( In favor of 、 neutral 、 against ).
(5) How to pay for goods ( cash 、 The credit card 、 Check ).
answer : Variables can be divided into : Categorical variables 、 Sequential variables and numerical variables .(2)(5) It belongs to classification variable ;(4) It belongs to sequence variable ;(1)(3) It belongs to numerical variable .
2 A research department is preparing to extract 2000 The annual per capita income of all working families in the city is inferred from working families . requirement :
(1) Describe the population and sample .
(2) Point out parameters and statistics .
answer :(1) In general “ All the working families in the city ”, The sample is “ Extraction of 2000 Working families ”.
(2) Parameter is “ The annual per capita income of all working families in the city ”, The statistics are “ Extraction of 2000 The annual per capita income calculated by families ”.
3 A research institution from IT Randomly selected from practitioners 1000 People were investigated as samples , among 60% Answer that their monthly income is 15000 Yuan of above ,50% Percent of the people answered that their consumption payment method is to use credit card .
Answer the following questions :
(1) What is the overall purpose of this study ?
(2) Monthly income is a categorical variable 、 Sequential variable or numerical variable ?
(3) Consumption payment method is a categorical variable 、 Sequential variable or numerical variable ?
(4) This research involves cross-sectional data or time series data ?
answer :(1) In general “ all IT practitioners ”;
(2) Monthly income is a numerical variable ;
(3) Consumption payment method is a categorical variable ;
(4) This study involves cross-sectional data .
4 A survey shows that , The average monthly cost of online shopping is 2000 element , The main reason why they choose to shop online is “ Cheapness ”.
Answer the following questions :
(1) What is the overall purpose of this study ?
(2)“ The reason why consumers shop online ” It's a categorical variable 、 Sequential variable or numerical variable ?
(3) What parameters do researchers care about ?
(4)“ The average monthly cost of online shopping is 2000 element ” Is it a parameter or a statistic ?
(5) Researchers mainly use descriptive statistical methods or inferential statistical methods ?
answer :(1) The overall purpose of this study is “ All online shoppers ”;(2)“ The reason why consumers shop online ” It's a categorical variable ;
(3) The parameters concerned by researchers are “ The average monthly cost of all online shoppers ”;
(4)“ The average monthly cost of online shopping is 2000 element ” It's statistics ;
(5) Researchers mainly use inferential statistical methods .
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