Question

Sales volume last weekend for a sample of ten car dealerships were as follows:

Data Point | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 |
---|---|---|---|---|---|---|---|---|---|---|

# Sales | 21 | 10 | 19 | 35 | 23 | 34 | 44 | 29 | 15 | 30 |

**What is the variance of the sample data?**

Please round your answer to the nearest tenth.

Note that the correct answer will be evaluated based on the
full-precision result you would obtain using Excel.

Answer #1

Solution :

We have a sample of size n = 10 .

To find the variance of this sample , we construct a table using Excel.

x | x2 | |

21 | 441 | |

10 | 100 | |

19 | 361 | |

35 | 1225 | |

23 | 529 | |

34 | 1156 | |

44 | 1936 | |

29 | 841 | |

15 | 225 | |

30 | 900 | |

SUM | 260 | 7714 |

Sample variance s^{2} =

= [1/(10 - 1)][7714 - (260^{2}/10) ]

= 106.0

**The variance of the given sample data is
106.0**

{

We can directly find the sample variance in excel. Use function

= VAR(select data)

}

**The variance of the given sample data is
106.0**

Sales volume last weekend for a sample of ten car dealerships
were as follows:
Data Point
1
2
3
4
5
6
7
8
9
10
# Sales
44
12
20
49
23
30
34
21
14
36
What is the standard deviation of the sample
data?
Please round your answer to the nearest tenth.
Note that the correct answer will be evaluated based on the
full-precision result you would obtain using Excel.

Sales volume last weekend for four samples, each consisting of
five car dealerships, were as follows:
Data Point
1
2
3
4
5
Sample 1
22
34
18
27
31
Sample 2
45
28
35
46
12
Sample 3
50
37
21
33
15
Sample 4
26
41
38
26
21
What is the standard deviation of the distribution of
sample means?
Please round your answer to the nearest tenth.
Note that the correct answer will be evaluated based on...

Sales volume last weekend for four samples, each consisting of
five car dealerships, were as follows:
Data Point
1
2
3
4
5
Sample 1
37
15
43
25
21
Sample 2
38
31
12
19
28
Sample 3
16
21
45
32
25
Sample 4
19
10
45
37
22
What is the mean of the distribution of sample
means?
Please round your answer to the nearest tenth.
Note that the correct answer will be evaluated based on the...

Consider the following sample data for the relationship between
advertising budget and sales for Product A:
Observation
1
2
3
4
5
6
7
8
9
10
Advertising ($)
40,000
40,000
50,000
60,000
60,000
60,000
70,000
80,000
80,000
90,000
Sales ($)
239,000
248,000
316,000
365,000
358,000
375,000
432,000
476,000
486,000
552,000
What is the predicted sales quantity for an advertising
budget of $64,000?
Please round your answer to the nearest integer.
Note that the correct answer will be evaluated based...

Consider the following sample data for the relationship between
advertising budget and sales for Product A:
Observation
1
2
3
4
5
6
7
8
9
10
Advertising ($)
40000
50000
50000
60000
70000
70000
80000
80000
90000
100000
Sales ($)
239000
315000
311000
363000
432000
493000
438000
493000
535000
603000
What is the slope of the "least-squares" best-fit regression
line? Please round your answer to the nearest hundredth. Note that
the correct answer will be evaluated based on the...

Consider the following sample data for the relationship between
advertising budget and sales for Product A:
Observation
1
2
3
4
5
6
7
8
9
10
Advertising ($)
100,000
110,000
110,000
120,000
130,000
130,000
140,000
150,000
150,000
160,000
Sales ($)
603,000
676,000
655,000
748,000
796,000
785,000
858,000
891,000
935,000
980,000
What is the slope of the "least-squares" best-fit
regression line?
Please round your answer to the nearest hundredth.
Note that the correct answer will be evaluated based on the...

Regression
1)
Consider the following sample data for the relationship between
advertising budget and sales for Product A:
Observation
1
2
3
4
5
6
7
8
9
10
Advertising ($)
30,000
30,000
40,000
50,000
50,000
50,000
60,000
70,000
80,000
80,000
Sales ($)
179,000
183,000
253,000
308,000
301,000
308,000
376,000
418,000
486,000
499,000
What is the slope of the "least-squares" best-fit
regression line?
Please round your answer to the nearest hundredth.
2)
Consider the following sample data for the relationship...

Consider the following sample data for the relationship between
advertising budget and sales for Product A:
Observation
1
2
3
4
5
6
7
8
9
10
Advertising($)
50000
60000
60000
70000
70000
80000
90000
90000
100000
110000
Sales ($)
299001
371000
364000
430000
440000
485000
535000
546000
595000
675000
Please round your answer to the nearest hundredth. Note that the
correct answer will be evaluated based on the full-precision result
you would obtain using Excel.What is the slope of...

Unit sales for new product ABC have varied in the first seven
months of this year as follows:
Month
Jan
Feb
Mar
Apr
May
Jun
Jul
Unit Sales
295
218
374
365
281
234
304
What is the (sample) skewness of the data?
Please round your answer to the nearest hundredth.
Note that the correct answer will be evaluated based on the
full-precision result you would obtain using Excel.

A car dealer believes that average daily sales for four
different dealerships in four separate states are equal. A random
sample of days results in the following data on daily sales:
Ohio: 3, 2, 6, 4, 4, 7, 2
New York: 10, 0, 7, 8, 0, Blank, Blank
West Virginia: 3, 4, 5, Blank, Blank, Blank, Blank
Pennsylvania: 20, 11, 8, 2, 14, Blank, Blank
Use ANOVA to test this claim at the 0.05 level.
Use Excel to support you...

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