Question: A company that sells mail-order computer systems has been planning inventory and staffing based on the assumption that the variance of weekly sales is 180² (thousands). The company selects 15 weeks at random from the past year and obtains the data (in thousands of dollars) shown below

Weekly sales 191 222 222 223 223 225 227 228 229 232

234 234 236 244 253

Verify the claim using an alpha value of 0.05