Claim: The mean cost of keyboards is equal to 69.3 dollars. For a random sample of

164 keyboards, the mean cost is 69 dollars and the standard deviation is 11.5 dollars. Complete parts(a) and(b) below.

a. Express the original claim in symbolic form.

mu

pp

sigma

greater than>

equals=

less than<

not equals

enter your response here

dollars

(Type an integer or a decimal. Do notround.)

b. Identify the null and alternative hypotheses.

H0:

sigma

pp

mu

equals=

greater than>

not equals

less than<

enter your response here

dollars

H1:

pp

mu

sigma

equals=

not equals

greater than>

less than<

enter your response here

dollars

(Type integers or decimals. Do notround.)