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Which hypothesis is set up for the purpose of either accepting or rejecting it? null

Which hypothesis is set up for the purpose of either accepting or rejecting it?
null

hypothesis

alternate hypothesis

research hypothesis

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both the null and alternate hypothesis

both the null and research hypothesis

A manufacturer of stereo equipment introduces new models in the fall. Retail dealers are surveyed immediately after the Christmas selling season regarding their stock on hand of each piece of equipment. It has been discovered that unless 40% of the new equipment ordered by the retailers in the fall had been sold by Christmas, immediate production cutbacks are needed. The manufacturer has found that contacting all of the dealers after Christmas by mail is frustrating as many of them never respond. This year 80 dealers were selected at random and telephoned regarding a new receiver. It was discovered that 38% of those receivers had been sold. Since 38% is less than 40%, does this mean that immediate production cutbacks are needed or can this difference of 2 percentage points be attributed to sampling? Test at the 0.05 level. Computed z = -0.37. 

Cut back production

Do not cut back production

Cannot determine based on information given

None of the above

A z-test was conducted to determine whether the mean selling price of homes in the Denver area is $224,000 or not. What is/are the critical value(s)?

1.96 or -1.96

1.96 and -1.96

1.96

-1.96

1.65

-1.65

A z-test was conducted to determine whether the mean selling price of homes in the Denver area is $225,000 or not. A sample of 105 homes revealed a mean price of $221,103 and a standard deviation of $47,105. What is the calculated z-score? (Don’t confuse this with critical z.)

-3,897

-8.68

-1.96

-.848

.848

1.96

8.68

A z-test was conducted to determine whether the mean selling price of homes in the Denver area is $225,000 or not. What is the alternate hypothesis?

H0: m = 225,000

H0: m ≠ 225,000

H1: a = 225,000

H1: a ≠ 225,000

H0: md = 0

H1: md ≠ 0

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