What is the sign of the product (−2) × (4) × (−6) × (−3)?

(a) positive, because the products (−2) × (4) and (−6) × (−3) are negative and the product of two negative numbers is positive

(b) positive, because the products (−2) × (4) and (−6) × (−3) are positive and the product of two positive numbers is positive

(c) negative, because the product (−2) × (4) is positive and the product (−6) × (−3) is negative and the product of a positive number and a negative number is negative

(d) negative, because the product (−2) × (4) is negative and the product (−6) × (−3) is positive and the product of a negative number and a positive number is negative

At wind speeds above 1000 centimeters per second (cm/sec), significant sand-moving events begin to occur. wind speeds below 1000 cm/sec deposit sand and wind speeds above 1000 cm/sec move sand to new locations. the cyclic nature of wind and moving sand determines the shape and location of large dunes. at a test site, the prevailing direction of the wind did not change noticeably. however, the velocity did change. fifty-nine wind speed readings gave an average velocity of x = 1075 cm/sec. based on long-term experience, σ can be assumed to be 245 cm/sec. (a) find a 95% confidence interval for the population mean wind speed at this site. (round your answers to the nearest whole number.) lower limit cm/sec upper limit cm/sec