In an upper lail test aboul the population mean, where the population standard deviation is known, a sample of size 30 was laken. Use 10% signiticance. Find the crilical value(s). Select one: a. Both -1.645 and 1.645 O b. Only 1.282 O c. Only - 1.282 C d. Both -1.699 and 1.699 Ce. Only -1.311 O 1. Oniy 1.311

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