Question
Month 2019 2020 January 2187 2148 Febrary 2722 2701 March 3383 1686 April 3043 462 May 3018 1624 June 2796 2692 July 3093 2722 August
| Month | 2019 | 2020 |
| January | 2187 | 2148 |
| Febrary | 2722 | 2701 |
| March | 3383 | 1686 |
| April | 3043 | 462 |
| May | 3018 | 1624 |
| June | 2796 | 2692 |
| July | 3093 | 2722 |
| August | 3988 | 2822 |
| September | 2594 | 2643 |
| October | 2721 | 2677 |
| November | 3038 | 2617 |
| December | 4044 | 3824 |
Based on the data in the table above, test the claim that the average number of monthly shoe sales decreased from 2019 to 2020 using a 0.01 significance level. Assume that the population standard deviations are unknown.
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Elementary Statisitcs
Authors: Barry Monk
2nd edition
1259345297, 978-0077836351, 77836359, 978-1259295911, 1259295915, 978-1259292484, 1259292487, 978-1259345296
