There is evidence that cytotoxic T lymphocytes (T cells) participate in controlling tumor growth and that they can be harnessed to use the body's immune system to treat cancer. One study investigated the use of a T cell-engaging antibody, blinatumomab, to recruit T cells to control tumor growth. The data below are T cell counts (1000 per microliter) at baseline (beginning of the study) and after 20 days on blinatumomab for six subjects in the study.The difference (after 20 days minus baseline) is the response variable.Baseline0.040.020.000.020.380.33After 20 days0.29 0.48 1.29 0.23 1.20 0.43 Difference:0.25 0.46 1.29 0.21 0.82 0.10--Give a 95% confidence interval for the mean difference in T cell counts (after 20 days minus baseline). (Round your answers to three decimal places.)

tothousand cells

Baseline0.040.020.000.020.380.33After 20 days0.290.481.290.231.200.43Difference0.250.461.290.210.820.10

you may need to use a z table